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Computer is a tool used to process data according to procedures that have been formulated.

The word computer was originally used to describe people whose work performed arithmetic calculations, 
with or without aids, but the meaning of the word was then transferred to the machine itself. Originally, 
information processing was almost exclusively related to arithmetic problems,but modern computers were 
used for many tasks unrelated to mathematics.

In that sense there are tools such as slide rules, mechanical calculator types ranging from abacus and beyond,  
to all contemporary electronic computers. Better terms that are suitable for broad meaning such as
 "computer" are "information processing" or "information processing systems."Over the years there have 
been several different meanings in the word"computer", and several different words are now referred to as
 The word computer in general has been used to define people performing arithmetic calculations, with or without
 auxiliary machines.Accordingto the Barnhart Concise Dictionary of Etymology, the word was used in English in 
1646 as the word for "one who counts" then before 1897 is also used as a "mechanical counting device". 
During World War II the word refers to US and British female workers whose work calculates the artillery path 
of war with a calculating machine. 
Charles Babbage designed one of the first calculating machines called an analytical engine. In addition, a variety of
 simple  machine tools such as slide rule can also be regarded as a computer.


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