Computers are tools used to process the data according to the procedures that have been formulated. Computer word originally used to describe the work people do arithmetic calculations, with or without tools, but the meaning of this word and then transferred to the machine itself. Their origins, processing information almost exclusively related to arithmetical problems, but modern computers are used for many tasks unrelated to mathematics.
In such a definition is a tool like a slide rule, mechanical calculator types ranging from abacus, and so on, until all contemporary electronic computers. Better terms suitable for a broad sense such as "computer" is "that process information" or "information-processing system."
According to the history of computers, computer generation is divided into 5 parts.
source: id.wikipedia.org
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