WHY COMPUTER IS A SYSTEM?

We said earlier that computer is a machine which does computation under specific wordy instructions. The computation job itself involves several other functions like reading the data, reading the program, outputting the result in a printed form in the desired format and so on. Each of these functions is done by separate functional units in the machine, but all of them act in coordination under common control. So we say that a computer is a huge system composed of several related functional units which act under a common control to achieve common objectives. A system is a composite entity made of inter-related elementary units or subsystems which jointly perform a task under the direction of a single control. The human being is a system, since it is composed of different functional units acting under a single control, the brain. In short, a system is a composite entity whose constituents work together for achieving a common goal. The constituents of a computer system also act together under a common control for doing the common job of data processing and so we say that the computer is a system.