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A computer is a general purpose device that can be programmed to carry out a set of arithmetic or logical operations automatically. , the computer can solve more than one kind of problem. A 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. Any tool used for calculation could be referred to as a computer. The earliest computers were tally sticks in use since around 20,000 BC. 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 mobile devices, and mobile computers can be powered by small batteries. Personal computers in their various forms are icons of the Information Age and are what most people think of as “computers.”
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