A computer is an electronic device that can receive, store, process, and output data. It consists of hardware components such as a central processing unit (CPU), memory, storage devices, input devices (such as a keyboard and mouse), and output devices (such as a monitor and printer). Computers can run various software programs to perform tasks such as word processing, browsing the internet, playing games, and more. They are used in a wide range of industries and applications, from personal use to business operations and scientific research.