A compact disc is a plastic optical disc with a metalized surface that is used for digital audio storage.When a compact disc is played, the information is read by a laser and converted into sound that represents an original audio source. The CD's storage capabilities have expanded alongside its technology to read other data like CD-ROM for computers or DVD and Blu-ray for video.
A standard CD typically holds 74 to 79 minutes of audio.The basic compact disc is simple in appearance, but consists of multiple layers. The base layer is polycarbonate plastic which holds the digital data.This layer is topped by an aluminum coating that serves to reflect the laser that reads the disc's information. (In rare instances, silver or gold may be used in place of aluminum).
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