A Wide Area Network (WAN) is a telecommunications network that connects multiple local area networks (LANs) over a large geographical area. It allows for the transmission of data, voice, and video across long distances, typically using leased lines or satellite links. The term "wide area" refers to the vast coverage of the network, which can span cities, countries, or even continents. Unlike a LAN, which is confined to a specific location like a home or office, a WAN enables communication between different locations and facilitates the sharing of resources and information.