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A compact disc (abbreviated as CD) is a five-inch optical disk storage media on which a digital audio signal is inscribed so that it can be read, especially by a laser beam device in a computer or CD player. The CD format was developed by Philips.
CD formats include CD-ROMs (CD Read-Only Memory) that are read-only; CD-Rs (CD Recordable) that are write to once and are then read-only; and CD-RWs (CD Re-Writable) that can be written to multiple times.