WAN (Wide Area Network) extends network connectivity over large geographical areas, connecting branch offices and remote locations to central hubs. WAN includes CSU/DSU, FTTx (Fiber to the x), multiplexers, and routers that manage long-distance communication. WAN modems provide reliable internet connectivity, while other WAN components like firewalls ensure security. WAN networks facilitate efficient data exchange across cities or countries, ensuring consistent connectivity for large enterprises and global organizations.