The Site Map feature provides a URL Mapping of your entire site. It lists out in a folder tree structure the URL's that have been discovered underneath your domain.
The benefit of the Site Map is that you can see the passes and failures based upon the location of the URL within your website. You may notice that URL's within a certain folder all fall victim to a lower score based upon some setting or other influencer to that folder.
Let's look at the following example:
The example above is a brief site map for some of the links found on webalyzing.com. Using this site map we can easily jump to certain links within specific folders of our site. We can also get a heirarchy of the urls accompanied by their respective score.