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Compact Disc

A compact disc is an optical disc format originally developed for the purpose of storing audio in the form of digital data. First available in 1982, the CD rose to popularity for commercial audio recordings and is only now being opposed by MP3 downloads played by devices such as the iPod. The compact disc itself is 120 mm in diameter, and can hold up to 80 minutes of uncompressed audio. The molded polymer discs have gave rise to other optical disc formats. Computer-readable data CD-ROMs, CD-R(W)s, and, eventually, DVDs all built upon the rudimentary technology of the compact disc.

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