Wide Area Network (WAN) is a network that covers a wide geographical are such as a country, continent or even the whole world. It is typically used to connect multiple LANs and other type of networks that are relatively for apart so that users at one location can communicate with users at some other location. For example: suppose an organization has two offices, one at Delhi and other at Mumbai. Computers within each office connect together to setup a LAN and these LANs then connect together to set up a WAN. The largest Wide Area Network is internet is Internet connecting millions of computers together.