The type of Network area connection that you choose for usage depends upon the scope of your needs. It also depends on the areas you want to cover and the number of computers you want to connect. To some extent it also depends on who is going to own the network.
A LAN is used when you want to establish a network on a small scale. This is usually done in case for houses and small businesses which are operated inside a single building. LANs are usually operated and administered by a single person.
WANs are used when the computers to be connected span on large areas which are far away from each other. A WAN has several owners and administrators.
A MAN is used to connect computers located in the same city or area and are usually under the control of the government.
A LAN is used when you want to establish a network on a small scale. This is usually done in case for houses and small businesses which are operated inside a single building. LANs are usually operated and administered by a single person.
WANs are used when the computers to be connected span on large areas which are far away from each other. A WAN has several owners and administrators.
A MAN is used to connect computers located in the same city or area and are usually under the control of the government.