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In computing, CD most often refers to a Compact Disc, a 12cm optical disc used for storing digital data like music, software, and documents. Variations include CD-ROM (Read-Only Memory) for pre-recorded data, CD-R (Recordable) for one-time writing, and CD-RW (Rewritable) for multiple write/erase cycles. While less common now, CDs are still used for installing software or backing up data on compatible devices.

What a CD is:

Optical Storage Medium: It's a round, flat disk made of polycarbonate plastic.

Digital Data Storage: It stores digital information by using a laser to read tiny bumps and pits on the disc's surface. Original Purpose: First developed by Philips and Sony to store and play audio recordings, it later expanded to store general computer data.

Types of CDs:

CD-ROM (Compact Disc Read-Only Memory): Contains data that cannot be changed after the disc is manufactured.

CD-R (Compact Disc-Recordable): Allows users to burn data onto it once, but the data cannot be erased or rewritten.

CD-RW (Compact Disc-Rewritable): Enables users to write, erase, and rewrite data multiple times.

Capacity: A standard CD can hold about 700 megabytes (MB) of data or approximately 80 minutes of audio.