LAN- Local Area Network which would be like the network at your office building.
WAN- Wide Are Network which would be like the internet or perhaps an office network that you may share across states or even countries.
CAN- Campus Area Network which would be like something at a university or perhaps a group of government buildings.
MAN- Metropolitan Area Network would be like a network that spanned across the city that your were in. Say you had several buildings in Manhattan that were on the same network but not located adjacent to each other.
HAN- A Home Area Network which would be like the network in your house. Also could be called a PAN or Personal Area Network.
All of these types of networks could in theory have the same equiptment so they can be very similar. Where they differ is mainly the distance between locations which can result in different resources for connecting the networks together. For instance a WAN could connect several LANS, CANS, or MANS. They could be connected via leased fiber optic lines that your company purchases. They usually have similar equiptment, but just use more of it. (routers, wan accellerators, switches..etc)