The Computer Processing is an action of series of actions that a microprocessor the is known as central processing unit. (CPU in short form). In a computer performs when it receives information for the processing. the instructions fed to a CPU by a software program alter the states of these transistors to perform calculations for the software program. CPU is known as brain of the computer .

When the first generation of the computer was introduced in the world that time the Vacuum Tube was used as the CPU. Second generation of computer was used Transistor as the CPU, same way in the third generation there was used Integrate Circuit (IC) as the processor. Finally  Micro Processor was developed and used in forth generation of computer.