Computers are machine designed to process, electronically, specially prepared pieces of information are termed data. The information, in from of intruction or data, is given to the machine is the input, the internal manipulative operations, the processing; and the result , the output.(Handling or manipulating the information that has been given to the computer in such ways are called processing).

The term "computer" includes those parts of hardware in which calculations and other data manipulation are performed, and the high-speed internal memory in which data and calculations are stored during actual execution program.Attach to the CPU are the various peripheral device, such as keyboard, screen,mouse, magnetic tape, magnetic disk.The computer is not single purpose machine.In the late 1950s and early 1960s, computer was expensive to own and run.And now, computer has become portable, more compact, and cheaper.Computer can remove many kind of of the routine and boring tasks from our lives, it leaving us with more time for interesting, creative word