The document defines the Internet as a global system of interconnected computer networks that use TCP/IP to serve billions of users worldwide. It consists of private, public, academic, business and government networks linked together. The Internet carries a wide range of information resources and services, including the World Wide Web and email infrastructure. The World Wide Web is a set of documents, images and resources logically linked by hyperlinks, while the Internet is a broader network of networks that uses many communication protocols, not just HTTP. Email is an important communication service available on the Internet that predates its creation, allowing electronic messages to be sent.