The Internet is a global network of computer networks. It is the hardware and software infrastructure that enables millions of computers to communicate with one another.
The World Wide Web is one of many services accessed through the Internet. It is a collection of documents (Web pages) that can be viewed on a browser, and which are connected to each other via hyperlinks.
A communications protocol is an agreed upon format for exchanging data between devices. The Internet operates on a set of protocols, collectively referred to as the Internet Protocol Suite, sometimes called TCP/IP after two of the most important protocols on it. The Web uses HTTP (Hypertext Transfer Protocol). In addition to HTTP, the Internet supports protocols for email, instant messaging, file transfers, peer-to-peer networks, and newsgroups.