From Bradley Mitchell,
Your Guide to Wireless / Networking.
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Definition: PCI (Peripheral Component Interconnect) is an industry specification for connecting hardware devices to a computer's central processor. Both Ethernet and Wi-Fi network adapters for desktop and notebook computers commonly utilize PCI.

PCI defines the electrical characteristics and signal protocol used for two devices to communicate over a computer's central bus. PCI network adapters and other devices exist in several different shapes and sizes called "form factors."

Besides traditional Ethernet PCI cards that manufacturers pre-install inside desktop computers, common PCI form factors for consumer network devices are:

• Card Bus - either Wi-Fi or Ethernet PC Card (also known as PCMCIA or "credit card") network adapters
• Mini PCI - Wi-Fi network cards embedded inside notebook computers

Also Known As: Periperhal Component Interconnect