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Before getting into the detail, it is essential to understand the concept of computer system computer system is a general purpose device which can be programmed to carry out a finite set of arithmetic or logical operations since a sequence of operation can be readily changed, the computer can. Computer systems analysts, sometimes called systems architects, study an organization's current computer systems and procedures, and design solutions to help the organization operate more efficiently and effectively they bring business and information technology (it) together by understanding the. A computer receives incoming data, processes them and produces an output hence, in a typical computer, there is the control unit organizes all the operations it selects, interprets and executes the programme instructions, (ii) arithmetic and logic unit (alu) it does all the arithmetic and logic.