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A computer is a device that can be instructed to carry out an arbitrary set of arithmetic or logicaloperations automatically. Their ability to follow a sequence of operations, called a program, make computers very flexible and popular. Such computers are used as control systems for a very wide variety of industrial and consumer devices. This includes simple special purpose devices like microwave ovens andremote controls, but more importantly in general purpose devices like personal computers and mobile devices. The internet is run on computers, and connects millions of these other computers.

Since ancient times, simple manual devices like the abacus aided people in doing calculations. Early in theIndustrial Revolution, some mechanical devices were built to automate long tedious tasks, such as patterns for looms. More sophisticated electrical machines did specialized analog calculations in the early 20th century. The first digital electronic calculating machines were developed during World War II. The speed, power, and versatility of computers increased continuously and dramatically since then, to the point of possible artificial intelligence in the near future.
Conventionally, a modern computer consists of at least one processing element, typically a central processing unit (CPU), and some form of memory. The processing element carries out arithmetic and logic operations, and a sequencing and control unit can change the order of operations in response to stored information. Peripheral devices allow information to be retrieved from an external source, and the result of operations saved and retrieved.

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