It is the means by which packets of data are addressed and delivered over the Internet to their destination. TCP stands for Transfer Control Protocol. When a user activates a link, a different page, complete with its own links, is opened. This different page could be on a different server anywhere in the world. These multitudinous cross-references can be imagined as a Web of connections from document to document.
Web pages are simply files stored on a computer that has been set up as a dedicated Web server.
Each Web server has its own address on the Internet. Each Web page stored on the server has its own file name. The related pages that make up a site are usually stored in the same directory. Upon loading index.htm, the user is presented with links to the other pages in my site, organized by topic. If this is still confusing, it may help to think of a Web page as a library reference book and the URL as the instructions on how to get to the library and find the book.