Network
From AMule Project FAQ
A network is a group of computers which inter-communicate with each other. In other words, a number of computers which share data between each other form a network.
As such, the ed2k network is a network, because it is theunion of several computers which share files. more on this, the internet itself is a network, because it is a gorup of computers which share data too.
Other examples can be local area networks (also known as LANs) or "virtual" networks such as instant messaging networks or workgroup networks.