外部链接标准（或称个人电脑接口，Personal Computer Interface），实际应用中简称为PCI（Peripheral Component Interconnect），是一种连接电脑主板和外部设备的总线标准。一般PCI设备可分为以下两种形式：

PCI bus常见于现代的个人电脑中，并已取代了ISA和VESA局部总线，成为了标准扩充总线。PCI总线亦常见于其他电脑类型中。PCI总线最终将被PCI Express和其他更先进的技术取代，这些技术现在已经被用于最新款的电脑中。

PCI规范规定了该总线的物理尺寸（包括线宽）、电气特性、总线时序和协议。该规范可从美国PCI-SIG协会购得。

Conventional PCI, often shortened to PCI, is a local computer bus for attaching hardware devices in a computer. PCI is the initialism for Peripheral Component Interconnect and is part of the PCI Local Bus standard. The PCI bus supports the functions found on a processor bus but in a standardized format that is independent of any particular processor's native bus. Devices connected to the PCI bus appear to a bus master to be connected directly to its own bus and are assigned addresses in the processor's address space. It is a parallel bus, synchronous to a single bus clock.