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. WANs utilize various transmission technologies, such as fiber optics, satellite, and wireless connections, to transmit data over long distances. They enable users to access resources and services from remote locations, making them essential for global operations and collaboration in today's interconnected world.