The Internet is a means by which you can access and communicate with other computers. You don't need to know which phone companies have to work together to make the connection or what equipment they are using. The Internet works the same way. Note that you don't actually logon to the Internet. In order to make this world-wide communication possible, every computer on the Internet has a unique address called an IP address.
Most computers also have a name, which is made up of a machine name and a domain name.
One of the most popular uses of the Internet. It's a way to send memos and messages electronically over the network. The main Internet protocol for logging in to a remote machine. Gopher often uses Telnet to establish remote connections. A distributed information service which uses a hierarchical menu system the user can browse.