A computer is a machine that can be programmed to automatically carry out sequences of arithmetic or logical operations (computation). Modern digital electronic computers can perform generic sets of operations known as programs.
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Computer hardware is the physical parts of a computer, while computer software is the programs that tell the hardware what to do. Both hardware and software are essential for a computer to function.
Computer input and output devices are hardware that allow users to input data into a computer and receive the results of that data processing.
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