Bridges and hubs connect computers to networks, and networks to other networks. Switches regulate the flow of information, making sure that packets of data take the right path to get to their destination. Satellites and Radio Equipment Wireless technologies are playing an increasing role in Internet communications. By freeing Internet users from the constraints of a wired connection, these tools are opening up new possibilities in mobile Internet use and offering the promise of Internet connections to people in remote areas. Of course, computers play a fundamental role in the Internet.
Routers determine the best path for information to get from one computer to another.
Firewalls are computers that hide an organization's network from the rest of the Internet in order to prevent hacks or break-ins. Proxies are servers that allow you to access the Internet through a firewall that protects your local network's inside data from outsiders. Of course, all the Internet's equipment isn't very useful without the countless pieces of software that actually make things happen. This software is based on the rules, or protocols , that are used to exchange information between computers. A protocol is a rule describing how things are done.