The Meaning of LAN, MAN and WAN :

LAN (Local Area Network) - A system that links together electronic office equipment, such as computers and word processors, and forms a network within an office or building.

MAN (Metpolitant Area Network) - a data network inteded to serve an area the size of large city.

WAN (Wired Area Network) - the best way to connect desktop computer to internet and to another computer at home