network
A network is a group of machines connected together by data cables, switches, routers, and hubs.
Networks vary in scale. A LAN (Local Area Network) is a small scale network, such as that you may find in an office, where several computers can share files and a printer. A WAN (Wide Area Network) is a large scale network, such as that which links together the offices of global corporations.
The Internet is the world's largest form of network. The Web is considered an artificial network which operates over the Internet.