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CD stands for “Compact Disk” is a secondary storage device which can store data up to 700mb on a single disk. It has the size is 4.75 in (12 cm) in diameter.
 

The saved data on cd can be used anytime depending upon the user need.This standard was projected was Sony and Philips companies and it is the most common storage media in computer world.
 

Initially, CDs were read-only, but newer technology allows users to record as well. CDs will probably continue to be popular for music recording and playback. A newer technology, the digital versatile disc (DVD), stores much more in the same space and is used for playing back movies.

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Christopher Latham Sholes (February 14, 1819 – February 17, 1890) was an American inventor who invented the QWERTY keyboard and along with Frank Haven Hall, Samuel W. Soule, Carlos Gladden and John Pratt, has been contended as one of the …

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