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Term Definition

A combination of hardware and software that separates a LAN into two or more parts for security purposes.

Floating Point Number
  • A method of representing an approximation of a real number in a way that can support a wide range of values. The numbers are, in general, represented approximately to a fixed number of significant digits (the significand) and scaled using an exponent.
  • A real number (that is, a number that can contain a fractional part).

A set of type of one particular face and size.


A very common method of moving files between two Internet sites. FTP is a special 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.

George Boole

George Boole was an English mathematician, philosopher and logician. He worked in the fields of differential equations and algebraic logic, and is now best known as the author of The Laws of Thought. The keyword Bool represents a Boolean datatype in many programming languages, though Pascal and Java, among others, both use the full name Boolean

Aliases (separate with |): boolean

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.


1000 or 1024 Megabytes, depending on who is measuring. If you have a computer hard drive or external hard drive and it says for example 100GB hard drive, and you see less than that amount available, that space is being used for programming or formatting the disk.


Git is an open-source DVCS (Distributed Version Control System)


(GNU ZIP) A popular compression program in the Unix world that is also available for Windows and Mac. Using the .GZ file extension, gzip compresses only a single file and is therefore often used in combination with the Unix "tar" utility when more than one file must be compressed. Tar combines multiple files into one archive, and gzip compresses that single archive, creating a file with the extension .TAR.GZ.

"Gunzip" is the gzip decompression utility, and it decompresses archives compressed with gzip or the Unix pack and compress commands. Many have lamented the fact that gzip includes the word "zip" because gzip cannot decompress files compressed with PKZIP. It was named that way because gzip uses one of the algorithms in PKZIP. However, in contrast, many PKZIP utilities can decompress gzip files. For more information, visit See archive formats.

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HTML is a markup language predominantly used for creating web pages. In modern sites, HTML is used to organize the contents of the website, while CSS and JavaScript are used to define the styles and behaviors respectively.


The protocol for moving hypertext files 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

Hypertext Preprocessor

PHP is a general-purpose scripting language that is especially suited for Web development and can be embedded into HTML.


Internet acronym for "In my humble opinion" or "In my honest opinion".


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.

As the Internet has become more popular many of the tools used on the Internet are being used in private networks, for example, many companies have web servers that are available only to employees.

Note that an Intranet may not actually be an internet -- it may simply be a network.

IP Address

Sometimes called a dotted quad. A unique number consisting of 4 parts separated by dots, (e.g.

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. Most machines also have one or more Domain Names that are easier for people to remember.

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