Bookmarks represent saved page states.  On the Manage Bookmarks screen, you will find 3 tabs:  My Bookmarks, All Bookmarks and Favorite Bookmarks.  Under My Bookmarks, you may navigate to your bookmark, edit it or delete it.  You also have the option to change your default view (always land on this view if selecting page from left navigation menu) or share the bookmark with others.  Under All Bookmarks, you may navigate to any Bookmark that other users have shared. Favorite bookmarks lists all bookmarks for which you have clicked the “star” icon to designate it as one of your favorites.