PCI stands for Peripheral Component Interconnect

In computer architecture, a bus is a subsystem that transfers data or power between computer components inside a computer or between computers. A bus can logically connect several peripherals over the same set of wires. Each bus defines its set of connectors to physically plug devices, cards or cables together.

Types of Buses:

1. Peripheral Component Interconnect (PCI) Bus:

• It specifies a computer bus forattaching peripheral devices to a computer motherboard.
• These devices can be in the form ofintegrated circuitsfitted on the motherboard itself orexpansion cardsthat fit in sockets.
• It is designed to support a single as well as microprocessor systems.
• It has ahigh bandwidth.
• Itdelivers better system performancefor high-speed I/O subsystems (e.g. graphic display adapters, disk controllers, etc.)

2. Universal Serial (US) Bus:It provides a serial bus standard for connecting devices, usually to computers such as personal computers. It has an asymmetric design, consisting of a host controller and multiple devices connected in a tree-like fashion using special hub devices, called USB hubs.