In English , Central Processing Unit (CPU) in Bengali , Central Processing Unit. Which is called a Canadian processor or main processor. Electronic circuitry within a computer that consists of basic mathematical , logic , control , and operation specified by input , output I and operation. The computer industry has used the term at least central processing unit since the early 1960 's. Traditionally , the term CPU refers to the processor , specifically its processing unit and control unit CU which separates the external components from the main components of the computer such as main memory and IO circuitry.