A central processing unit (CPU), also called a central processor, main processor, or just processor, is the most important processor in a given computer. Its electronic circuitry executes instructions of a computer program, such as arithmetic, logic, controlling, and input/output (I/O) operations. This role contrasts with that of external components, such as main memory and I/O circuitry, and specialized coprocessors such as graphics processing units (GPUs).

central processing unit (CPU), principal part of any digital computer system, generally composed of the main memory, control unit, and arithmetic-logic unit. It constitutes the physical heart of the entire computer system; to it is linked various peripheral equipment, including input/output devices and auxiliary storage units.

A Central Processing Unit is the most important component of a computer system. A CPU is hardware that performs data input/output, processing, and storage functions for a computer system. A CPU can be installed into a CPU socket. These sockets are generally located on the motherboard. CPU can perform various data processing operations.

A central processing unit (CPU) is the primary functional component of a computer. The CPU is an assemblage of electronic circuitry that run a computer’s operating system and apps and manage a variety of other computer operations. A CPU is, essentially, the active brain of the computer.

CPU stands for Central Processing Unit; it is also known as "the brain of the computer". A CPU is a primary component of a computer that performs most of the processing and controls the operation of all components running inside a computer. The key components of a CPU are the Control Unit, ALU and Memory.