Answer: The basic organization of a computer system is the processing unit, memory unit, and input-output devices. The processing unit controls all the functions of the computer system. It is the brain of the computer e.g. CPU. The memory unit consists of two units. One is an arithmetic unit and the other is a logic unit. Input devices are those devices through which end-users can send messages to computers e.g. keyboard, mouse, etc. Output devices are those devices through which end-users get output from computers e.g. monitors.