A Wide Area Network (WAN) is a telecommunications network that extends over a large geographical area, connecting multiple local area networks (LANs). WANs are commonly used by businesses and organizations to facilitate communication and data sharing between offices located in different cities or countries. They can utilize various transmission technologies, including leased lines, satellite links, and public networks like the Internet. WANs enable users to access resources and applications remotely, improving collaboration and productivity. They often rely on routers and switches to manage data traffic and ensure secure connections. Popular examples of WAN technologies include MPLS (Multiprotocol Label Switching) and VPNs (Virtual Private Networks), which help maintain privacy and security over long distances.