The WWW uses electronic addresses called URLs, or Uniform Resource Locators.  These URLs take the form of "http//www.ezn.com/welcome" (this is an example).  The "http" tells the browser what it is looking for, a Hyper Text document.  A URL is a "link" to another page on the server, or to another server.  Meaning, when you click on a "link", you are taken to another area.  Links can look like underlined text or a picture.  The mouse pointer will change shape when it's over a "link".