It knows how to communicate with the computer that stores the document, as well as how to download it to your computer and then display the contents of the document in a meaningful form on your computer screen. This indicates the presence of what is known as a 'hyperlink'. Hyperlinks are used to link Web documents and Web sites to one another. How they work can be complex. All you need to know, however, is that if you click on a hyperlink, you instruct your Web browser to connect to the linked Web document or site.
Hyperlinks make the Web user-friendly.
The Web site or document that you are viewing contains all the commands necessary to instruct your Web browser to connect to the document or Web site and display it on your computer.