HISTOTY OF COMPUTER A computer is a digital electronic machine that can be programmed to carry out sequences of arithmetic or logical operations ( computation ) automatically. Modern computers can perform generic sets of operations known as programs . These programs enable computers to perform a wide range of tasks. A computer system is a "complete" computer that includes the hardware , operating system (main software ), and peripheral equipment needed and used for "full" operation. This term may also refer to a group of computers that are linked and function together, such as a computer network or computer cluster . A broad range of industrial and consumer products use computers as control systems . Simple special-purpose devices like microwave ovens and remote controls are included, as are factory devices like industrial robots and computer-aided design , as well as general-purpose devices like personal computers and mobi