What is the difference between the Internet and the World Wide Web? Are they one and the same? No, they are not. The Web, or WWW, is a part of the Internet. The Internet is, "a worldwide network of networks."* So what is a network? A network is one or more computers connected together.
This is the basic information that should be included in elementary school library and information literacy classes.
One book that does a good job presenting this basic information is The Incredible Story of Computers and the Internet: A Kid's Guide to Incredible Technology* by Greg Roza.