What is a CPU?

CPU is short for central processing unit. The CPU is the part of the computer that is most responsible for the computer’s speed. The CPU’s processing speed is measured in gigahertz (GHz). The CPU can be thought of as the computer’s “engine” with the GHz corresponding to an engine’s horsepower. Each GHz equals 1,000 MHz, so a speed of 2.4 GHz is equal to 2,400 MHz.