A WAN, or Wide Area Network, is a telecommunications network that extends over a large geographical area. It connects multiple smaller networks, such as LANs (Local Area Networks), allowing devices in different locations to communicate with each other. WANs are commonly used by businesses and organizations to link offices in different cities or countries. WANs can be established using various technologies, including satellite, fiber optics, and leased lines. They enable data sharing, internet access, and communication services across vast distances. This connectivity is essential for modern businesses, facilitating collaboration and information exchange among employees and clients worldwide.