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Cache

Temporary storage of frequently accessed files. Browser caches contain copies of recently downloaded web files. The size of the browser cache and the rate at which the browser reloads the page from the server can be set by the user. Accessing cached files is much faster than downloading them over the Internet.



CGI

Common Gateway Interface. Standardized interface which specifies how a web server communicates with programs run on that webserver and web pages.



CMYK

Cyan, Magenta, Yellow and Black. An acronym for the four ink colours used in process printing. CMYK colours are simulated on a monitor through the use of additive red, green and blue light (RGB).



Cookie

Cookies are small text files containing information about the user. The cookie is stored either on the user's hard disk or in the computer's RAM. The main goal of cookies is to personalize a user's Internet viewing experience, based on the user's past preferences. Cookies can be erased at the end of a session or kept until a certain expiration date. They can be encrypted or in plain text. Should the user not want to receive cookies, he/she has the option of disabling all cookies, or limiting their use to certain Internet sites.



Compression

Compression is a technique which reduces the size of a file or a data stream to speed up its transfer or save disk space. The most popular compression programs are PKZIP, WinZip, Stuffit and gnu zip. Compressed or "zipped" files often bear one of the following extensions: arc, arj, gz, tar, tgz, and zip.



Cropping

Trimming away part of an image to limit it to the desired area.



Cryptography

Encryption of data for safe transmission over a network. Data is encoded using mathematical algorithms, then sent over the Internet and deciphered by the receiving user. There are various levels of cryptography in use today, the most common being 128-bit cryptography.



CSS

Cascading Style Sheet. Style sheets contain style definitions that allow a user to control how various web page elements (margins, font size & colour, cell background etc.) are to be displayed. Styles can be applied to HTML tags, or freely defined as classes. A entire website can be formatted simply by linking each page to a single external stylesheet, making stylesheets very practical. Additionally, styles can be embedded directly into the HTML code ("inline") to change the appearance of that particular web page.



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