The World Map gives you an overall view of where you are as well as the locations of all the Players in your server.  You can gather all different types of Resources on the World Map, and you can attempt to eliminate Neutral Gangs.  You can also send your Troops to attack other cities, occupy one of their Blocks, and plunder their Resources.  This will weaken their strength.  Explore the World Map to locate other Family Members and use it to keep track of the location of your friends and enemies.