This document discusses different types of CDs and their uses. Compact discs are optical discs that can store digital data, including text, high-quality sound, or video. CDs are commonly used to store music and have largely replaced vinyl records, cassette tapes, and mini discs for listening to and sharing music. They can also be used for computer data storage, video games, and software distribution.

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http://aimanalmazrou.blogspot.com/2009/10/blog-post_27.htm 
http://elearning.akbarmontada.com/t220-topic. 