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The basic structure of computer system consists mainly of three parts which are the central processing unit (CPU), Input devices, and output devices. Further, the Central processing unit can be divided into two more parts i.e. control unit (CU) and arithmetic logic unit (ALU).

The basic structure of the computer describes a simple concept that the data is entered into the central processing unit with the help of input devices such as a keyboard, mouse, joystick, scanner, secondary storage devices, etc and then when the central processing unit receives the data from the input devices it has a pre-programmed set of instruction to follow and the result of instruction execution will lead to output and these output produce are mostly for the user which requires output devices such as a monitor, speaker, etc to understand the processed output data.

These functional unit of the computer makes the block diagram of the computer. The computer divides the task among these various functional units.