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The Compact Disc, or CD for short, is an optical disc used to store digital data.

It was originally developed to store and play back sound recordings only, but the format was later adapted for storage of data ( CD-ROM ), write-once audio and data storage ( CD-R ), rewritable media ( CD-RW ), Video Compact Discs ( VCD ), Super Video Compact Discs ( SVCD ), PhotoCD, PictureCD, CD-i, and Enhanced CD.

Audio CDs and audio CD players have been commercially available since October 1982.