Internet vs WWW

DIFFERENCES BETWEEN THE WORLD WIDE WEB AND THE INTERNET

All of the web sites in the world, taken together, make up the World Wide Web. The Internet is the worldwide network of interconnected computers, including both web servers and computers like the one on your desk that run web browser software. The Internet also carries other kinds of network traffic unrelated to the web.

Let's put it even more simply:

The Internet is the actual network. The World Wide Web is something you can do with it. You can do other things with it, too. Playing Quake or sending email both use the Internet but are not the World Wide Web.