A central processing unit (CPU) is the electronic circuitry within a computer that carries out the instructions of a computer program by performing the basic arithmetic, logical, control and input/output (I/O) operations specified by the instructions. The term has been used in the computer industry at least since the early 1960s.[1] Traditionally, the term CPU refers to a processing unit, or processor, and its control unit (CU), distinguishing these core elements of a computer from external components such as main memory and I/O circuitry

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