Internet - The Internet is a massive network of networks, a networking infrastructure. It connects millions of computers together globally, forming a network in which any computer can communicate with any other computer as long as they are both connected to the Internet. Information that travels over the Internet does so via a variety of languages known as protocols.
World Wide Web - The World Wide Web (AKA the web) is a way of accessing information over the internet. It is an information-sharing model that is built on top of the internet. The Web uses the HTTP protocol, one of the languages spoken over the Internet, to transmit data. Web services, which use HTTP to allow applications to communicate in order to exchange business logic, use the the Web to share information. The web also uses browsers (i.e. Internet Explorer, Mozilla firefox) to access web documents (called web pages!) that are linked to each other via hyperlinks. The World Wide Web is just one of the ways that information can be shared over the Internet.