The Internet is a giant computer network linking computers from all over the world. For some users, the Internet is an infrastructure to access public and private networks. For other users, it is the essential bridge for the Web and email. The Internet comprises four essential parts:

1. computers,
2. networks,
3. software, and
4. users.

The Internet supports a wide range of services that are available to users.
The basic Internet services are:

1. Electronic mail (email)
2. World Wide Web (the Web)
3. Mailing lists and newsgroups
4. Chat
5. File Transfer Protocol