Some other companies that make CPUs are ARM, IBM, and AMD under ATI Technologies, which is the leader right now. Most CPUs used in desktop (home) computers are microprocessors made by either Intel or Advanced Micro Devices (usually shortened to AMD). Modern processors often run so fast that gigahertz (GHz) is used instead. The clock rate, or speed of a CPU's internal parts, is measured in hertz (Hz).
A list of instructions that a CPU can run is a computer program. It reads the list of instructions and runs ( executes) each one in order. The CPU is an electronic machine that works on a list of computer things to do, called instructions. The CPU sends signals to control the other parts of the computer, almost like how a brain controls a body.
A central processing unit ( CPU) is an important part of every computer.
