Cache

A section of memory on a PC which is very fast (but very expensive) in which data which may be used in a moment is stored for quicker access. If the data is used, then a 'cache hit' occurs, otherwise a 'cache miss' occurs. Cache is also used for Web browsers but the meaning is slightly different. In Web browsers, cache is an area of network space or hard drive space that is used to store commonly accessed pages so they can be loaded from there next time rather than the Internet itself, making the loading of a page faster.

CGI

Common Gateway Interface. A method by which Web pages can be generated instantly in response to new pieces of information that may have been submitted from a form, for example a guestbook.

CMOS

Complimentary Metal-Oxide Semiconductor. A special RAM Chip which contains vital information about the PC, such as what type of hard drive is being used and how much RAM is installed. CMOS is normally powered by a small battery so that when the PC is switched off, the CMOS memory
isn't erased.

Compress

A way in which data is 'made smaller' by removing the reduntant information from it in order for it to transfer more quickly and occupy less disk space.

Cookie

A small piece of data which is stored using your internet browser, which when you return to a particular website can be used to provide customised information.  Cookies expire after a predetermined time, whereby it is deleted from the hard disk drive of the browser machine.

CPU

Central Processing Unit. The 'brain' of the computer, which controls every other component installed.

Cybercafe

A cafe or bar which also has computers which can be connected to the Internet. The customer can have a drink or something to eat while using the computers. They are normally charged by the half-hour.