Stands for Compact Disc. A small plastic disc that is used to store up to 650Mb of data. The data is stored in the form of tiny holes etched on to the surface of the disc. A CD drive spins the disc and uses a laser beam to read the holes in the surface. A CD can store any type of computer data from images to text to music. However, it can only be read by a user. You cannot save data on to a CD. A CD normally refers to a normal music disc which can be played in your hi-fi or in your PC's CD player. You just plug in a pair of headphones and use the MediaPlayer utility to start playing. In the computer world, the same type of plastic disc is used to store files and data and is called a CD-ROM (Read Only Memory).
