Glossary of Internet Terms

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Last update: February 25 2004

ADN -- (Advanced Digital Network): Usually refers to a 56Kbps leased-line.
See also: Leased Line
ADSL -- (Asymmetric Digital Subscriber Line): A DSL line where the upload speed is different from the download speed. Usually the download speed is much greater.
See also: DSL, SDSL
Anonymous FTP: See also: FTP
Applet: A small Java program that can be embedded in an HTML page. Applets differ from full-fledged Java applications in that they are not allowed to access certain resources on the local computer, such as files and serial devices (modems, printers, etc.), and are prohibited from communicating with most other computers across a network. The common rule is that an applet can only make an Internet connection to the computer from which the applet was sent.
See also: HTML, Java
Archie: A tool (software) for finding files stored on anonymous FTP sites. You need to know the exact file name or a substring of it. By 1999 Archie had been almost completely replaced by web-based search engines.

Back when FTP was the main way people moved files over the Internet archie was quite popular.
See also: FTP
ARPANet -- (Advanced Research Projects Agency Network): The precursor to the Internet. Developed in the late 60's and early 70's by the US Department of Defense as an experiment in wide-area-networking to connect together computers that were each running different system so that people at one location could use computing resources from another location.
See also: Internet (Upper case I), Network, WAN
ASCII -- (American Standard Code for Information Interchange): This is the defacto world-wide standard for the code numbers used by computers to represent all the upper and lower-case Latin letters, numbers, punctuation, etc. There are 128 standard ASCII codes each of which can be represented by a 7 digit binary number: 0000000 through 1111111.
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Backbone: A high-speed line or series of connections that forms a major pathway within a network. The term is relative as a backbone in a small network will likely be much smaller than many non-backbone lines in a large network.
See also: Network
Bandwidth: How much stuff you can send through a connection. Usually measured in bits-per-second. A full page of English text is about 16,000 bits. A fast modem can move about 57,000 bits in one second. Full-motion full-screen video would require roughly 10,000,000 bits-per-second, depending on compression.
See also: Bit, bps, T-1
Baud: In common usage the baud rate of a modem is how many bitsit can send or receive per second. Technically, baud is the number of times per second that the carrier signal shifts value - for example a 1200 bit-per-second modem actually runs at 300 baud, but it moves 4 bits per baud (4 x 300= 1200 bits per second).
See also: Bit, Modem
BBS -- (Bulletin Board System): A computerized meeting and announcement system that allows people to carry on discussions, upload and download files, and make announcements without the people being connected to the computer at the same time. In the early 1990's there were many thousands (millions?) of BBS?s around the world, most are very small, running on a single IBM clone PC with 1 or 2 phone lines. Some are very large and the line between a BBS and a system like AOL gets crossed at some point, but it is not clearly drawn.
Binary: Information consisting entirely of ones and zeros. Also, commonly used to refer to files that are not simply text files, e.g. images.
See also: MIME, UUENCODE
Binhex -- (BINary HEXadecimal): A method for converting non-text files (non-ASCII) into ASCII. This is needed because Internet e-mail can only handle ASCII.
See also: ASCII, MIME, UUENCODE
Bit -- (Binary DigIT): A single digit number in base-2, in other words, either a 1 or a zero. The smallest unit of computerized data. Bandwidthis usually measured in bits-per-second.
See also: Bandwidth, Bit, bps, Byte, Kilobyte, Megabyte
BITNET -- (Because It's Time NETwork (or Because It's There NETwork)): A network of educational sites separate from the Internet, but e-mail is freely exchanged between BITNET and the Internet. Listservs®, a popular form of e-mail discussion groups, originated on BITNET. At its peak (the late 1980's and early 1990's) BITNET machines were usually mainframes, often running IBM's MVS operating system. BITNET is probably the only international network that is shrinking.
See also: Internet (Upper case I), Listserv ®, Network
Blog -- (weB LOG): A blog is basically a journal that is available on the web. The activity of updating a blog is "blogging" and someone who keeps a blog is a "blogger." Blogs are typically updated daily using software that allows people with little or no technical background to update and maintain the blog.

Postings on a blog are almost always arranged in chronological order with the most recent additions featured most prominently.
bps -- (Bits-Per-Second): A measurement of how fast data is moved from one place to another. A 56K modem can move about 57,000 bits per second.
See also: Bandwidth, Bit
Browser: A Client program (software) that is used to look at various kinds of Internet resources.
See also: Client, Server, URL, WWW
BTW -- (By The Way): A shorthand appended to a comment written in an online forum.
See also: IMHO
Byte: A set of Bits that represent a single character. Usually there are 8 Bits in a Byte, sometimes more, depending on how the measurement is being made.
See also: Bit
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CATP -- (Caffeine Access Transport Protocol): Common method of moving caffeine across Wide Area Networks such as the Internet
CATP was first used at the Binary Cafe in Cybertown and quickly spread world-wide.
There are reported problems with short-circuits and rust and decaffinated beverages were not supprted until version 1.5.3
See also: Internet (Upper case I), IRC, WAN
Certificate Authority: An issuer of Security Certificates used in SSL connections.
See also: SSL
CGI -- (Common Gateway Interface): A set of rules that describe how a Web Server communicates with another piece of software on the same machine, and how the other piece of software (the ?CGI program?) talks to the web server. Any piece of software can be a CGI program if it handles input and output according to the CGI standard.
See also: Server, WWW
cgi-bin: The most common name of a directory on a web server in which CGIprograms are stored.
See also: CGI
Client: A software program that is used to contact and obtain data from a Server software program on another computer, often across a great distance. EachClient program is designed to work with one or more specific kinds of Server programs, and each Server requires a specific kind of Client. A Web Browser is a specific kind of Client.
See also: Browser, Client, Server
co-location: Most often used to refer to having a server that belongs to one person or group physically located on an Internet-connected network that belongs to another person or group. Usually this is done because the server owner wants their machine to be on a high-speed Internet connection and/or they do not want the security risks of having the server on thier own network.
See also: Internet (Upper case I), Network, Server
Cookie: The most common meaning of "Cookie" on the Internet refers to a piece of information sent by a Web Server to a Web Browser that the Browser software is expected to save and to send back to the Server whenever the browser makes additional requests from the Server.
Depending on the type of Cookie used, and the Browsers' settings, the Browser may accept or not accept the Cookie, and may save the Cookie for either a short time or a long time.
Cookies might contain information such as login or registration information, online "shopping cart" information, user preferences, etc.
When a Server receives a request from a Browser that includes a Cookie, the Server is able to use the information stored in the Cookie. For example, the Server might customize what is sent back to the user, or keep a log of particular users' requests.
Cookies are usually set to expire after a predetermined amount of time and are usually saved in memory until the Browser software is closed down, at which time they may be saved to disk if their "expire time" has not been reached.
Cookies do not read your hard drive and send your life story to the CIA, but they can be used to gather more information about a user than would be possible without them.
See also: Browser, Server
CSS -- (Cascading Style Sheet): A standard for specifying the appearance of text and other elements. CSS was developed for use with HTML in Web pages but is also used in other situations, notably in applications built using XPFE. CSS is typically used to provide a single "library" of styles that are used over and over throughout a large number of related documents, as in a web site. A CSS file might specify that all numbered lists are to appear in italics. By changing that single specification the look of a large number of documents can be easily changed.
See also: HTML, Web page, XPFE
Cyberpunk: Cyberpunk was originally a cultural sub-genre of science fiction taking place in a not-so-distant, dystopian, over-industrialized society. The term grew out of the work of William Gibson and Bruce Sterling and has evolved into a cultural label encompassing many different kinds of human, machine, and punk attitudes. It includes clothing and lifestyle choices as well.
See also: Cyberspace
Cyberspace: Term originated by author William Gibson in his novel Neuromancer the word Cyberspace is currently used to describe the whole range of information resources available through computer networks.
See also: Cyberpunk
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DHTML -- (Dynamic HyperText Markup Language): DHTML refers to web pages that use a combination of HTML, JavaScript, and CSS to create features such as letting the user drag items around on the web page, some simple kinds of animation, and many more.
See also: CSS, HTML, JavaScript, Web page
Digerati: The digital version of literati, it is a reference to a vague cloud of people seen to be knowledgeable, hip, or otherwise in-the-know in regardsto the digital revolution.
DNS -- (Domain Name System): The Domain Name System is the system that translates Internet domain names into IP numbers. A "DNS Server" is a server that performs this kind of translation.
See also: Domain Name, IP Number, Server
Domain Name: The unique name that identifies an Internet site. Domain Names always have 2 or more parts, separated by dots. The part on the left is the most specific, and the part on the right is the most general. A given machine may have more than one Domain Name but a given Domain Name points to only one machine. For example, the domain names:
matisse.net mail.matisse.net workshop.matisse.net
can all refer to the same machine, but each domain name can refer to no more than one machine.
Usually, all of the machines on a given Network will have the same thing as the right-hand portion of their Domain Names (matisse.net in the examples above). It is also possible for a Domain Name to exist but not be connected to an actual machine. This is often done so that a group or business can have an Internet e-mail address without having to establish a real Internet site. In these cases, some real Internet machine must handle the mail on behalf of the listed Domain Name.
See also: IP Number, TLD
Download: Transferring data (usually a file) from a another computer to the computer your are using. The opposite of upload.
See also: Upload
DSL -- (Digital Subscriber Line): A method for moving data over regular phone lines. A DSL circuit is much faster than a regular phone connection, and the wires coming into the subscriber's premises are the same (copper) wires used for regular phone service. A DSL circuit must be configured to connect two specific locations, similar to a leased line (howeverr a DSL circuit is not a leased line.
A common configuration of DSL allows downloads at speeds of up to 1.544 megabits (not megabytes) per second, and uploads at speeds of 128 kilobits per second. This arrangement is called ADSL: Asymmetric Digital Subscriber Line.

Another common configuration is symmetrical: 384 Kilobits per second in both directions.

In theory ADSL allows download speeds of up to 9 megabits per second and upload speeds of up to 640 kilobits per second.

DSL is now a popular alternative to Leased Lines and ISDN, being faster than ISDN and less costly than traditional Leased Lines.

See also: ADSL, Bandwidth, ISDN, Leased Line, SDSL
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Email -- (Electronic Mail): Messages, usually text, sent from one person to another via computer. E-mail can also be sent automatically to a large number of addresses.
See also: Listserv ®, SMTP
Ethernet: A very common method of networking computers in a LAN.
There is more than one type of Ethernet. By 2001 the standard type was "100-BaseT" which can handle up to about 100,000,000 bits-per-second and can be used with almost any kind of computer.

See also: Bandwidth, FDDI, LAN
Extranet: An intranet that is accesible to computers that are not hysically part of a companys' own private network, but that is not accessible to the general public, for example to allow vendors and business partners to access a company web site.
Often an intranet will make use of a Virtual Private Network. (VPN.)

See also: Intranet, Network, VPN
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FAQ -- (Frequently Asked Questions): FAQs are documents that list and answerthe most common questions on a particular subject. There are hundreds of FAQs on subjects as diverse as Pet Grooming and Cryptography. FAQs are usually written by people who have tired of answering the same question over and over.
FDDI -- (Fiber Distributed Data Interface): A standard for transmitting data on optical fiber cables at a rate of around 100,000,000 bits-per-second (10 times as fast as 10-BaseTEthernet, about twice as fast as T-3).
See also: Ethernet, T-3
Finger: An Internet software tool for locating people on other Internet sites. Finger is also sometimes used to give access to non-personal information, but the most common use is to see if a person has an account at a particular Internet site. Many sites do not allow incoming Finger requests, but many do.
Fire Wall: A combination of hardware and software that separates a Network into two or more parts for security purposes.
See also: Network
Flame: Originally, "flame" meant to carry forth in a passionate manner in the spirit of honorable debate. Flames most often involved the use of flowery language and flaming well was an art form. More recently flame has come to refer to any kind of derogatory comment no matter how witless or crude.
See also: Flame War
Flame War: When an online discussion degenerates into a series of personal attacks against the debators, rather than discussion of their positions. A heated exchange.
See also: Flame
FTP -- (File Transfer Protocol): A very common method of moving files between two Internet sites.
FTP is a way to login to another Internet site for the purposes of retrieving and/or sending files. There are many Internet sites that have established publicly accessible repositories of material that can be obtained using FTP, by logging in using the account name "anonymous", thus these sites are called "anonymous ftp servers".

FTP was invented and in wide use long before the advent of the World Wide Web and originally was always used from a text-only interface.

See also: Login, WWW
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Gateway: The technical meaning is a hardware or software set-up that translates between two dissimilar protocols, for example America Online has a gateway that translates between its internal, proprietary e-mail format and Internet e-mail format. Another, sloppier meaning of gateway is to describe any mechanism for providing access to another system, e.g. AOL might be called a gateway to the Internet.
GIF -- (Graphic Interchange Format): A common format for image files, especially suitable for images containing large areas of the same color. GIF format files of simple images are often smaller than the same file would be if stored in JPEG format, but GIF format does not store photographic images as well as JPEG.
See also: JPEG, PNG
Gigabyte: 1000 or 1024 Megabytes, depending on who is measuring.
See also: Byte
Gopher: Invented at the University of Minnesota in 1993 just before the Web, gopher was a widely successful method of making menus of material available over the Internet.
Gopher was designed to be much easier to use than FTP, while still using a text-only interface.

Gopher is a Client and Server style program, whichrequires that the user have a Gopher Client program. Although Gopher spread rapidly across the globe in only a couple of years, it has been largely supplanted by Hypertext, also known as WWW (World Wide Web). There are still thousands of Gopher Servers on the Internet and we can expect they will remain for a while.

See also: Client, FTP, WWW
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hit: As used in reference to the World Wide Web, ?hit? means a single request from a web browser for a single item from a web server; thus in order for a web browser to display a page that contains 3 graphics, 4 ?hits? would occur at the server: 1 for the HTML page, and one for each of the 3 graphics.
See also: Browser, HTML, Server
Home Page (or Homepage): Several meanings. Originally, the web page that your browser is set to use when it starts up. The more common meaning refers to the main web page for a business, organization, person or simply the main page out of a collection of web pages, e.g. "Check out so-and-so's new Home Page."
See also: Browser, WWW
Host: Any computer on a network that is a repository for services available to other computers on the network. It is quite common to have one host machine provide several services, such as SMTP (email) and HTTP (web).
See also: Network, SMTP
HTML -- (HyperText Markup Language): The coding language used to create Hypertext documents for use on the World Wide Web. HTML looks a lot like old-fashioned typesetting code, where you surround a block of text with codes that indicate how it should appear.
The "hyper" in Hypertext comes from the fact that in HTML you can specify that a block of text, or an image, is linked to another file on the Internet. HTML files are meant to be viewed using a "Web Browser".
HTML is loosely based on a more comprehensive system for markup called SGML.
See also: Browser, Hypertext, WWW
HTTP -- (HyperText Transfer Protocol): The protocol for moving hypertextfiles across the Internet. Requires a HTTP client program on one end, and an HTTP server program on the other end. HTTP is the most important protocol used in the World Wide Web (WWW).
See also: Client, Hypertext, Server, WWW
Hypertext: Generally, any text that contains links to other documents - words or phrases in the document that can be chosen by a reader and which cause another document to be retrieved and displayed.
See also: HTML, HTTP
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IMAP -- (Internet Message Access Protocol): IMAP is gradually replacing POP as the main protocol used by email clients in communicating with email servers.
Using IMAP an email client program can not only retrieve email but can also manipulate message stored on the server, without having to actually retrieve the messages. So messages can be deleted, have their status changed, multiple mail boxes can be managed, etc.
IMAP is defined in RFC 2060
See also: Client, Email, POP, RFC, Server
IMHO -- (In My Humble Opinion): A shorthand appended to a comment written in an online forum, IMHO indicates that the writer is aware that they areexpressing a debatable view, probably on a subject already under discussion. One of many such shorthands in common use online, especially in discussion forums.
internet (Lower case i): Any time you connect 2 or more networks together, you have an internet - as in inter-national or inter-state.
See also: Internet (Upper case I), Network
Internet (Upper case I): The vast collection of inter-connected networks that are connected using the TCP/IP protocols and that evolved from the ARPANET of the late 60's and early 70's.
The Internet connects tens of thousands of independent networks into a vast global internet and is probably the largest Wide Area Network in the world.
See also: internet (Lower case i), Network, WAN
Intranet: A private network inside a company or organization that uses the same kinds of software that you would find on the public Internet, but that is only for internal use. Compare with extranet.
See also: Extranet, internet (Lower case i), Internet (Upper case I)
IP Number -- (Internet Protocol Number): Sometimes called a dotted quad. A unique number consisting of 4 parts separated by dots, e.g.
165.113.245.2
Every machine that is on the Internet has a unique IP number - if a machine does not have an IP number, it is not really on the Internet. Many machines (especially servers) also have one or more Domain Names that are easier for people to remember.
See also: Domain Name, Server, TCP/IP
IRC -- (Internet Relay Chat): Basically a huge multi-user live chat facility. There are a number of major IRC servers around the world which are linked to each other. Anyone can create a channel and anything that anyone types in a given channel is seen by all others in the channel. Private channels can (and are) created for multi-person conference calls.
See also: Server
ISDN -- (Integrated Services Digital Network): Basically a way to move more dataover existing regular phone lines. ISDN is available to much of the USA and in most markets it is priced very comparably to standard analog phone circuits. It can provide speeds of roughly 128,000 bits-per-second over regular phone lines. In practice, most people will be limited to 56,000or 64,000 bits-per-second.
Unlike DSL, ISDN can be used to connect to many different locations, one at a time, just like a regular telephone call, as long the other location also has ISDN.
See also: DSL
ISP -- (Internet Service Provider): An institution that provides access to the Internet in some form, usually for money.
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Java: Java is a network-friendly programming language invented by Sun Microsystems.
Java is often used to build large, complex systems that involve several different computers interacting across networks, for example transaction processing systems.
Java is also becoming popular for creating programs that run in small electronic devicws, such as mobile telephones.
A very common use of Java is to create programs that can be safely downloaded to your computer through the Internet and immediately run without fear of viruses or other harm to your computer or files. Using small Java programs (called "Applets"), Web pages can include functions such as animations,calculators, and other fancy tricks.
See also: Applet, JDK
JavaScript: JavaScript is a programming language that is mostly used in web pages, usually to add features that make the web page more interactive. When JavaScript is included in an HTML file it relies upon the browser to interpret the JavaScript. When JavaScript is combined with Cascading Style Sheets(CSS), and later versions of HTML (4.0 and later) the result is often called DHTML.
See also: HTML
JDK -- (Java Development Kit): A software development package from Sun Microsystems that implements the basic set of tools needed to write, test and debugJava applications and applets
See also: Applet, Java
JPEG -- (Joint Photographic Experts Group): JPEG is most commonly mentioned as a format for image files. JPEG format is preferred to the GIF format for photographic images as opposed to line art or simple logo art.
See also: GIF, PNG
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Kilobyte: A thousand bytes. Actually, usually 1024 (2¹⁰) bytes.
See also: Byte
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LAN -- (Local Area Network): A computer network limited to the immediate area, usually the same building or floor of a building.
See also: Network, VPN, WAN
Leased Line: Refers to line such as a telephone line or fiber-optic cable that is rented for exclusive 24-hour, 7-days-a-week use from your location to another location. The highest speed data connections require a leased line.
See also: DSL, ISDN
Linux: A widely used Open Source Unix-like operating system. Linux was first released by its inventor Linus Torvalds in 1991. There are versions of Linux for almost every available type of computer hardware from desktop machines to IBM mainframes. The inner workings of Linux are open and available for anyone to examine and change as long as they make their changes available to the public. This has resulted in thousands of people working on various aspects of Linux and adaptation of Linux for a huge variety of purposes, from servers to TV-recording boxes.
See also: Open Source Software, Unix
Listserv ®: The most common kind of maillist, "Listserv" is a registered trademark of L-Soft international, Inc. Listservs originated on BITNET but they are now common on the Internet.
See also: BITNET, Internet (Upper case I), Maillist
Login: Noun or a verb.
Noun: The account name used to gain access to a computer system. Not a secret (contrast with Password).

Verb: the act of connecting to a computer system by giving your credentials (usually your "username" and "password")

See also: Password
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Maillist: (or Mailing List) A (usually automated) system that allows people to send e-mail to one address, whereupon their message is copied and sent to all of the other subscribers to the maillist. In this way, people who have many different kinds of e-mail access can participate in discussions together.
See also: Email, Listserv ®
Megabyte: A million bytes. Actually, technically, 1024 kilobytes.
See also: Byte, Kilobyte
Meta Tag: A specific kind of HTML tag that contains information not normally displayed to the user. Meta tags contan information about the page itself, hence the name ("meta" means "about this subject")
Typical uses of Meta tags are to include information for search engines to help them better categorize a page.
You can see the Meta tags in a page if you view the pages' source code.
See also: HTML, Search Engine, SEO
MIME -- (Multipurpose Internet Mail Extensions): Originally a standard for defining the types of files attached to standard Internet mail messages. The MIME standard has come to be used in many situations where one cmputer programs needs to communicate with another program about what kind of file is being sent.
For example, HTML files have a MIME-type of text/html, JPEG files are image/jpeg, etc.
See also: HTML, JPEG
Mirror: Generally speaking, "to mirror" is to maintain an exact copy of something. Probably the most common use of the term on the Internet refers to "mirror sites" which are web sites, or FTP sites that maintain copies of material originated at another location, usually in order to provide more widespread access to the resource. For example, one site might create a library of software, and 5 other sites might maintain mirrors of that library.
See also: FTP, WWW
Modem -- (MOdulator, DEModulator): A device that connects a computer to a phone line. A telephone for a computer. A modem allows a computer to talk to other computers through the phone system. Basically, modems do for computers what a telephone does for humans.
MOO -- (Mud, Object Oriented): One of several kinds of multi-user role-playing environments.
See also: MUD
Mosaic: The first WWW browser that was available for the Macintosh, Windows,and UNIX all with the same interface. Mosaic really started the popularity of the Web. The source-code to Mosaic was licensed by several companies and used to create many other web browsers.
Mosaic was developed at the National Center for Supercomputing Applications (NCSA), at the Univeristy of Urbana-Champange in Illinois, USA. The first version was released in late 1993.
See also: Browser, WWW
MUD -- (Multi-User Dungeon or Dimension): A (usually text-based) multi-user simulation environment. Some are purely for fun and flirting, others are used for serious software development, or education purposes and all thatlies in between. A significant feature of most MUDs is that users can create things that stay after they leave and which other users can interact within their absence, thus allowing a world to be built gradually and collectively.
See also: MOO
MUSE -- (Multi-User Simulated Environment): One kind of MUD - usually with little or no violence.
See also: MUD
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Netiquette: The etiquette on the Internet.
Netizen: Derived from the term citizen, referring to a citizen of the Internet,or someone who uses networked resources. The term connotes civic responsibility and participation.
Netscape: A WWW Browser and the name of a company. The Netscape (tm) browser was originally based on the Mosaic program developed at the National Center for Supercomputing Applications (NCSA).
See also: Mosaic
Network: Any time you connect 2 or more computers together so that they can share resources, you have a computer network. Connect 2 or more networks together and you have an internet.
See also: internet (Lower case i)
Newsgroup: The name for discussion groups on USENET.
See also: USENET
NIC -- (Network Information Center): Generally, any office that handles information for a network. The most famous of these on the Internet was the InterNIC, which was where most new domain names were registered until that process was decentralized to a number of private companies. Also means "Network Interface card", which is the card in a computer that you plug a network cable into.
See also: Domain Name, Network
NNTP -- (Network News Transport Protocol): The protocol used by clientand server software to carry USENET postings back and forth over a TCP/IP network. If you are using any of the more common software such as Netscape, Nuntius, Internet Explorer, etc. to participate in newsgroups then you are benefiting from an NNTP connection.
See also: Client, Server, TCP/IP
Node: Any single computer connected to a network.
See also: Network
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Open Content: Copyrighted information (such as this Glossary) that is made available by the copyright owner to the general public under license terms that allow reuse of the material, often with the requirement (as with this Glossary) that the re-user grant the public the same rights to the modified version that the re-user received from the copyright owner.
Information that is in the Public Domain might also be considered a form of Open Content.
See also: Open Source Software
Open Source Software: Open Source Software is software for which the underlying programming code is available to the users so that they may read it, make changes to it, and build new versions of the software incorporating their changes. There are many types of Open Source Software, mainly differing in the licensing term under which (altered) copies of the source code may (or must be) redistributed.
See also: Open Content
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Packet Switching: The method used to move data around on the Internet. In packet switching,all the data coming out of a machine is broken up into chunks, each chunk has the address of where it came from and where it is going. This enables chunks of data from many different sources to co-mingle on the same lines, and be sorted and directed along different routes by special machines along the way. This way many people can use the same lines at the same time.
You might think of several caravans of trucks all using the same road system to carry materials.
See also: Internet (Upper case I), Router
Password: A code used to gain access (login) to a locked system. Good passwords contain letters and non-letters and are not simple combinations such as virtue7. A good password might be:
5%df(29)
But don't use that one!
See also: Login
ping: To check if a server is running. From the sound that a sonar systems makes in movies, you know, when they are searching for a submarine.
Plug-in: A (usually small) piece of software that adds features to a larger piece of software. Common examples are plug-ins for the Netscape® browser and web server. Adobe Photoshop® also uses plug-ins.
See also: Browser, Server
PNG -- (Portable Network Graphics): PNG is a graphics format specifically designed for use on the World Wide Web. PNG enable compression of images without any loss of quality, including high-resolution images. Another important feature of PNG is that anyone may create software that works with PNG images without paying any fees - the PNG standard is free of any licensing costs.
See also: GIF, JPEG
POP -- (Point of Presence, also Post Office Protocol): Two commonly used meanings:
Point of Presence and Post Office Protocol.
A Point of Presence usually means a city or location where a network can be connected to, often with dial up phone lines. So if an Internet company says they will soon have a POP in Belgrade, it means that they will soon have a local phone number in Belgrade and/or a place where leased lines can connect to their network.

A second meaning, Post Office Protocol refers to a way that e-mail client software such as Eudora gets mail from a mail server. When you obtain an account from an Internet Service Provider (ISP) you almost always get a POP account with it, and it is this POP account that you tell your e-mail software to use to get your mail. Another protocol called IMAP is replacing POP for email.

See also: Client, Email, IMAP, ISP, Server
Port: 3 meanings. First and most generally, a place where information goes into or out of a computer, or both. E.g. the serial port on a personal computer is where a modem would be connected.
On the Internet port often refers to a number that is part of a URL, appearing after a colon (:) right after the domain name. Every service on an Internet server listens on a particular port number on that server. Most services have standard port numbers, e.g. Web servers normally listen on port 80. Services can also listen on non-standard ports, in which case the port number must be specified in a URL when accessing the server, so you might see a URL of the form:
gopher://peg.cwis.uci.edu:7000/
This shows a gopher server running on a non-standard port (the standard gopher port is 70).

Finally, port also refers to translating a piece of software to bring it from one type of computer system to another, e.g. to translate a Windows program so that is will run on a Macintosh.

See also: URL
Portal: Usually used as a marketing term to described a Web site that is or is intended to be the first place people see when using the Web. Typically a "Portal site" has a catalog of web sites, a search engine, or both. A Portal site may also offer email and other service to entice people to use that site as their main "point of entry" (hence "portal") to the Web.
Posting: A single message entered into a network communications system.
PPP -- (Point to Point Protocol): The most common protocol used to connect home computers to the Internet over regular phone lines.
Most well known as a protocol that allows a computer to use a regular telephone line and a modem to make TCP/IPconnections and thus be really and truly on the Internet.

See also: Modem, SLIP, TCP/IP
Protocol: On the Internet "protocol" usually refers to a set of rules that define an exact format for communication between systems. For example the HTTP protocol defines the format for communication between web browsers and web servers, the IMAP protocol defines the format for communication between IMAP email servers and clients, and the SSL protocol defines a format for encrypted communications over the Internet.

Virtually all Internet protocls are defined in RFC documents.
See also: FTP, HTTP, IMAP, POP, PPP, RFC, SLIP, SMTP, SNMP, SSL, TCP/IP, UDP
Proxy Server: A Proxy Server sits in between a Client and the "real" Server that a Client is trying to use. Client's are sometimes configured to use a Proxy Server, usually an HTTP server. The clients makes all of it's requests from the Proxy Server, which then makes requests from the "real" server and passes the result back to the Client. Sometimes the Proxy server will store the results and give a stored result instead of making a new one (to reduce use of a Network). Proxy servers are commonly established on Local Area Networks
See also: Client, HTTP, LAN, Network, Server
PSTN --