Web browsers also use auxilliary applications, called plug-ins, to display certain media. Some sites may ask you to register or to subscribe before you are allowed to browse their pages. Often, they want to know more about you so they can gather information about their visitors and the people using their products. Certain sites, like the Encyclopedia Britannica , charge for their services. We will avoid linking to commercial sites.
Websites are collections of web pages.
Web pages are the browser's manifestation of several files on a computer called a server. As you get deeper and deeper into a site, there should be icons directing you back to higher levels. Clicking this will take you to the home page. If you decide to go forward again, you can also retrace your steps up the path in the last fork you traveled. There are several ways of travelling back and forth with a browser.