A WAN connects two or more LANs together.
This might be two company LANs in the same town, which are just too far apart, to be part of the same LAN.
It might be LANs on different sides of the world. For example, a company might have offices in London, New York, Paris and Rome.
The largest WAN in existence is the internet.
This connects billions of LANs together to form the largest, and most diverse, network.
