From Shane McGlaun,
Your Guide to Computer Peripherals.
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Definition: PCI is short for Peripheral Component Interconnect. The PCI slot is a local system bus standard that was introduced by the Intel Corporation, however, it is not exclusive to any form of processors and PCI slots are found in both Windows PCs and Macs. PCI slots allow numerous different types of expansion cards to be connected inside a computer to extend the computers functionality. Examples of PCI expansion cards are network cards, graphics cards and sound cards.

Also Known As: Peripheral Component Interconnect