A WAN, or wide area network, is a computer Network that covers a large geographic area. WAN Fiber is the fiber Cable used to connect people, devices, and other networks, such as LANs (local area networks), to the WAN. WANs are generally not privately owned. Data is transmitted over leased lines in a WAN as opposed to LANs that do not use leased lines. Data Transmission is slightly slower with WANs than with LANs.

WANs connect multiple LANs and other smaller area networks. The Internet is a good example of a WAN that joins LANs and MANs (metropolitan area networks) across the globe.