A Wide Area Network (WAN) is a telecommunications network that extends over a large geographical area, connecting multiple local area networks (LANs) and devices. WANs are commonly used by businesses and organizations to facilitate communication and data sharing across different locations, such as offices in various cities or countries. WANs utilize various technologies, including satellite, fiber optics, and leased lines, to transmit data over long distances. They enable users to access shared resources, such as servers and applications, regardless of their physical location, making them essential for modern communication and collaboration in a globalized world.