A computer is an electronic device that can accept data as input, process that data according to programmed instructions, produce output in the form of information or results, and store that output for future use. It works by taking in data through various input devices like keyboards, mice, microphones, scanners, digital cameras, and video cameras, processing that data, and producing information or storing results according to its programmed instructions. The main components of a computer are the input devices, central processing unit, memory, storage, and output devices.