The processing element carries out arithmetic and logical operations, and a sequencing and control unit can change the order of operations in response to stored information. The speed, power, and versatility of computers have increased continuously and dramatically since then.Ĭonventionally, a modern computer consists of at least one processing element, typically a central processing unit (CPU), and some form of memory. The first digital electronic calculating machines were developed during World War II. More sophisticated electrical machines did specialized analogue calculations in the early 20th century. Early in the Industrial Revolution, some mechanical devices were built to automate long tedious tasks, such as guiding patterns for looms. Since ancient times, simple manual devices like the abacus, aided people in doing calculations. The ability of computers to follow a sequence of operations, called a program, make computers very applicable to a wide range of tasks. It is a device that can be instructed to carry out an arbitrary set of arithmetic or logical operations automatically. It has the ability to store, retrieve, and process data. A computer is an electronic device that manipulates information, or data.
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