LAN is local area network, which is pretty much inside the building. WAN is wide area network or connections from building to building, which could be a few feet or many miles.
The purpose is to allow communications to occur between buildings long distances apart, but within the same company.
WANs
Similarities between LANS and WANS is that they are both networks and can cover small geographical areas.
Intranet
Yes, it can.
You can join LANs and WANs with a Hub, Router, Switch, Gateway, Bridge, Network Interface Card (NIC) and a WAP (Wireless Access Point)..
lans are more faster than wans
The Internet links LANs and WANs together.
Types of networks - including LANs, WANs and WLANs
Gilbert Held has written: 'Internetworking LANs and WANs' -- subject(s): Protected DAISY
Security. WANs connect buildings together, LANs are inside of buildings. They are similar but not the same. If you don't have more than one location, you don't need a WAN.
WAN ( Wide Area Network )
To connect ( n ) LANs such that each LAN can directly communicate with any other LAN, you need ( \frac{n(n-1)}{2} ) point-to-point WANs. This is because each LAN requires a dedicated connection to every other LAN, and since communication is bidirectional, each pair of LANs is connected by one WAN link. Thus, the formula accounts for all unique pairs of LANs.