Modding is the special modifications added to a game. There are different kinds of mods. Ships, Stations, maps, planets, map backgrounds, races, weapons, the interface, even the campaigns. There are also mods which make a completely new game, such as Fleet Operations. One example of modding is that modders have created races from the series Babylon 5. There have also been official tools from Activision that have been used to create mods. One of the most popular modding sites is Armada 2 files.