Links are nodes.
You can think of them as magic trapdoors that let you move around the Web. Clicking on a hyperlink, you make a connection to another location in the same Web document, or to another document on the Web. Hypertext lets readers jump around a given set of documents by clicking on linked words and images so that they can follow their associations and interests. By clicking on a hyperlinked term, the user is taken to a definition, or a picture, or both. The cross-referencing potential of hypertext has been exploited in the design of the Web.