PCI @ Wikipedia
The Peripheral Component Interconnect, or PCI Standard (in practice almost always shortened to PCI) specifies a computer bus for attaching peripheral devices to a computer motherboard.
These devices can take any one of the following forms: An integrated circuit fitted onto the motherboard itself, called a planar device in the PCI specification.
An expansion card that fits into a socket.
The PCI bus is common in modern PCs, where it...