Compact Disc (CD)

A Compact Disc (CD) is a small, round, flat disc used to store digital data, primarily music. Data is encoded as tiny bumps and flat areas on the disc's surface, which are read by a laser in a CD player. The laser detects the differences between the bumps and flat areas and converts them into electrical signals, producing sound or other information. CDs are popular because they provide high-quality audio, are durable, and can hold several hours of music or large amounts of data in a portable format.