CD

English (en)

CD
Compact Disc (CD) is a flat 
moulded circular plastic storage 
disc containing digital data that 
is scanned by a laser beam. CD was 
first used for the reproduction of 
recorded sound. Since its commercial 
introduction in 1982, the audio CD 
has almost completely replaced the 
phonograph disc (or record) for 
high-fidelity recorded music.