What is Central Processing Unit (CPU)?

CPUCentral Processing Unit is the heart of the computer system. Its configuration determines whether the computer is fast or slow in relation to other computers. The CPU is most complex computer system component responsible for directing most of the computer system activities based on the instructions provided. As one computer generation evolved to the next, the size of CPU has become smaller and smaller, while its speed and capacity have tremendously increased. The CPU circuitry of a micro computer is called a microprocessor, fits on a chip about the size, thumb nail or even smaller.