A computer is a device that can be instructed to carry out sequences of arithmetic or logical operations automatically. Computers are used as control systems for a wide variety of industrial and consumer devices.
Modern computers have the ability to follow generalized sets of operations, called programs. This includes simple special purpose devices like microwave ovens and remote controls, factory devices such as industrial robots and computer assisted design, and also general purpose devices like personal computers and mobile devices such as smartphones. The speed, power, and versatility of computers have been increasing dramatically.