A computer is an electronic device that takes in data from input devices, processes the data, and provides meaningful output. It was pioneered by Charles Babbage. Computers can store large amounts of data, perform complex calculations quickly and accurately, and work for long periods without tiring. Generations of computers progressed from using vacuum tubes to transistors to integrated circuits and now microprocessors. The CPU processes input data and provides output. Common input devices include keyboards, mice, and cameras, while common output devices are monitors, printers, and speakers.