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A CD or Compact Disc is a device in which one can store digital data. Originally the CD was used solely to record play back songs. Later through modern technology it was improvised and any kind of data storage was possible. Today, we have CD ROM, rewriteable CDs, Video CDs, and audio CD players. A standard CD holds up to 80 minutes of uncompressed audio recording and spins on laser technology. Initially the CD was produced only to store data, but Sony and Phillips started recorded stored music which became very popular.