A compact disc [sometimes spelled disk]
(CD) is a small, portable, round medium made of molded polymer (close in size
to the floppy disk)
for electronically recording, storing, and playing back audio, video, text, and
other information in digital
form. Tape cartridges and CDs generally replaced the phonograph record for
playing back music. At home, CDs have tended to replace the tape cartridge
although the latter is still widely used in cars and portable playback devices.
Initially, CDs were read-only, but newer
technology allows users to record as well. CDs will probably continue to be
popular for music recording and playback. A newer technology, the digital
versatile disc (DVD), stores much more in the same space and is used for
playing back movies.
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