From Shane McGlaun,
Your Guide to Computer Peripherals.
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Definition: CPU is short for Central Processing Unit. The CPU can be thought of as the brains of the computer system. Often people mistake the case or chassis of their computer as the CPU. The CPU is actually an internal component of the computer that can not bee seen from the outside of the system, or the inside without removing the CPU heatsink and fan. A CPU is commonly the most expensive component of a computer and is very sensitive to static electricity.

Also Known As: Central Processing Unit