PCIe is short for Peripheral Component Interconnect Express.

It is a high-speed standard bus interface for connecting motherboard components such as graphics cards, sound cards, Ethernet cards, high-speed WiFi and SSDs.

PCIe is a versatile interface developed for extremely low latency devices. It is basically a bus interface for plugging modern expansion cards into modern computers or motherboards. PCIe slots are available in a variety of physical configurations - the most common are 1x, 4x, 8x and 16x.

The PCIe architecture is based on a bidirectional embedded clock interface that uses differential signaling on point-to-point links without the need for physical sideband signaling connections.