Answer:
Peer to Peer Network
Explanation:
In a peer to peer network, the 'peers' are computer systems which are connected to each other via the Internet. Files can be shared directly between systems on the network without the need of a central server. In other words, each computer on a peer to peer network becomes a file server as well as a client.
The only requirements for a computer to join a peer-to-peer network are an Internet connection and a peer to peer software.
A contact list is different from an address book because your constancy list consist of people whom you know and choose to communicate with, while the address book gives you a list of the community’s residents phone numbers.
