A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

CCD
Charge-Coupled Device. Instead of recording images on film, digital cameras use a charge-coupled device - an electronic sensor that converts light patterns into digital signals. The number of light-sensitive cells on the CCD determines the resolution of the camera, measured in megapixels.

CD
Compact Disc

CDR
Recordable CD giving digital quality. There is no loss of sound or no sound deterioration when recording onto Recordable CDs. Recordable Compact Disc also allows up to 650Mb of data to be stored very cheaply on a Compact Disc. Data is written to the CDR using a special CD Writer, but once written, is permanently burned into the CD and cannot be erased or re-written.

CGI
Common Gateway Interface. This is the mechanism by which a "script" receives the data entered by a web user (when you fill in an online form and click 'submit', for example).

CRT
Acronym for a Cathode Ray Tube, the heart of a TV, consisting of a phosphor panel and electron gun

CYMK
Cyan, magenta, yellow and black. The four (subtractive) process colours that are used in four-colour printed reproduction.