Made up of one or more microprocessors and associated components. The CPU controls system activities including interpretation and execution of programs. It has an arithmetic logic unit (ALU), timing and control circuitry, accumulator, scratch-pad memory, program counter, address stack, and instruction register.
The main component, or "brain," of a computer. It is the chip that performs all of the information processing. The piece of hardware that contains the CPU is often called the CPU. (Terms, Gr. 2-3)