A great feature when browsing the World Wide Web is the ability to bookmark websites that interest you. These bookmarks offer a way for you to save the link and return to the same content at a later date.
Some web pages contain variables in the URL, which identify the particular content that you're accessing. You can share a copy of the URL with someone else, and they can see exactly what you are seeing too. Of course, we can also apply this convenience to web-mapping applications.