Data

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Raw facts and figures called data and after processing it becomes information which can be used for any purposes. Commonly the data is entered into the computer for processing to find out the result which can be used for decisions making and any other purpose depending upon the user need.
 

A program is a set of data that consists of a series of coded software instructions to control the operation of a computer or other machine. Physical computer memory elements consist of an address and a byte/word of data storage. Digital data are often stored in relational databases, like tables or SQL databases, and can generally be represented as abstract key/value pairs.

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The hard disk was invented on September 13, 1956 by IBM team led by Rey Johnson (considered as “father” of the disk drive). Earlier hard disk drives were large and cumbersome devices.