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 shared resources, such as files and applications, regardless of their physical location. This connectivity is essential for modern enterprises, allowing for collaboration and efficient operations. Technologies like MPLS and VPN are often employed to enhance the performance and security of WANs.