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Computer - Wikipedia, the free encyclopedia
A computer is a programmable machine that receives input, stores and manipulates data, and provides output in a useful format. Although mechanical examples of computers have ...
Personal computer - Wikipedia, the free encyclopedia
A personal computer (PC) is any general-purpose computer whose size, capabilities, and original sales price make it useful for individuals, and which is intended to be operated ...
The IEEE Computer Society
The IEEE Computer Society serves computing professionals’ information needs with technical publications, conferences, books, proceedings, certifications, and courses.
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Your Source for the Best Deals on the Net; Save on Computer Parts, Computer Hardware, Laptop Computers, Desktop Computers and More with Fast, Discounted Shipping...
Laptop Computers, Desktops, Printers & more Computer - Yahoo! Shopping
Laptop Computers, Desktops, Printers & more Computer products on Yahoo! Shopping. Compare prices, find reviews & coupons, and buy from online computer stores.
HowStuffWorks "How PCs Work"
PCs are now used by almost everyone in some aspect of daily life. Learn everything about PC parts, operating systems, portable PCs and future technology.
Computer - Simple English Wikipedia, the free encyclopedia
A Computer is a machine that changes information according to well-specified rules. Computers have existed for much of human history. Examples for early computers are the astrolabe ...
Computers - How To Information | eHow.com
Computers: You've been putting it off long enough, but it's time to trash that old, outdated computer and buy something new. We have everything you need to know about how to ...
Computers|Shop, Compare, and Save at Become.com
Save on computers, computer accessories, computer components, and find the best laptop deals. Search reviews, product guides, and much more at Become.com.
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240px|thumb|The Columbia Supercomputer, located at the NASA Ames Research Center.

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Wikipedia about Computer

240px|thumb|The Columbia Supercomputer, located at the NASA Ames Research Center.

A computer is a programmable machine that receives input, stores and manipulates data, and provides output in a useful format.

Although 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). These were the size of a large room, consuming as much power as several hundred modern personal computers (PCs). Modern computers based on integrated circuits are millions to billions of times more capable than the early machines, and occupy a fraction of the space. Simple computers are small enough to fit into small pocket devices, and can be powered by a small battery. Personal computers in their various forms are icons of the Information Age and are what most people think of as "computers". The embedded computers found in many devices from MP3 players to fighter aircraft and from toys to industrial robots are however the most numerous.

The ability to store and execute lists of instructions called programs makes computers extremely versatile, distinguishing them from calculators. The Church–Turing thesis is a mathematical statement of this versatility: any computer with a certain minimum capability is, in principle, capable of performing the same tasks that any other computer can perform. Therefore computers ranging from a netbook to a supercomputer are all able to perform the same computational tasks, given enough time and storage capacity.

History of computing