A block diagram of a computer is a system in which the principal parts or functions are represented by blocks connected by lines that show the relationships of the blocks.
The computers block diagrams are heavily used in engineering in hardware design, electronic design, software design, and process flow diagrams.
The computer system consists of mainly three types that are central processing unit (CPU),Input Devices, and Output Devices and the Central processing unit (CPU) again consists of ALU (Arithmetic Logic Unit) and Control Unit.