Types of Network According Area

1: LAN (Local Area Network)
2: MAN (Metropolitan Area Network)
3: WAN (Wide Area Network)

LAN
A Local Area Network is the Network of different Computers in well defines and Small Area like a Network of any organization in one building or cluster of buildings But should be with in 1KM.
MAN
A Metropolitan Area Network is the Network of different remote access buildings
In one city. A city can be large and small. OR the Network of different LANs in one City is called MAN.
WAN
A wide Area Network is Network of different LANs which exist in different cities or Different countries.