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A computer is a programmable machine that receives input, stores and automatically manipulates data, and provides output in a useful format. Mechanical examples of computers have existed through much of recorded human history. The first electronic computers were developed in the mid-20th century (1940–1945).Important instances of "Computer":
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![[Delta-C personal computer, ZX Spectrum+ clone]](http://images.ookaboo.com/photo/t/Delta_C_personal_computer_t.jpg "Delta-C personal computer, ZX Spectrum+ clone")
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![["Centcom", User:Grunt's computer. Taken on August 18, 2004.]](http://images.ookaboo.com/photo/t/Centcom20040818_t.jpg "\"Centcom\", User:Grunt's computer. Taken on August 18, 2004.")
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![[Dell PowerEdge Servers running various services for [http://dorsia.com Dorsia]]](http://images.ookaboo.com/photo/t/Dell_PowerEdge_Servers_t.jpg "Dell PowerEdge Servers running various services for [http://dorsia.com Dorsia]")
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![[A mid-range HP Laptop.]](http://images.ookaboo.com/photo/t/HPLaptopzv6000series_t.jpg "A mid-range HP Laptop.")
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![[The Zuse Z3, 1941, considered the world's first working programmable, fully automatic computing machine]](http://images.ookaboo.com/photo/t/Z3_Deutsches_Museum_t.jpg "The Zuse Z3, 1941, considered the world's first working programmable, fully automatic computing machine")
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![[Hard disk drives are common storage devices used with computers.]](http://images.ookaboo.com/photo/t/HDDspin_t.jpg "Hard disk drives are common storage devices used with computers.")
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