This document is about PCI Express, which is a high-speed serial computer expansion bus standard. It was developed by Intel, IBM, Microsoft, Apple, Compaq and HP in 2003. PCI Express supports a variety of applications, including networking, graphics, storage and video. PCI Express is a dual-channel serial bus that uses point-to-point connections and allows bidirectional data transmission over serial links. PCI Express is a high-performance, low-cost, low-power bus standard that is one of the most widely used bus standards in computer systems today.