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A mod is an unofficial modification or an expansion of a game. Mods varry from balance mods (something like official patches) to total conversion mods which are games of their own. Mods also can be divided to nostalgia mods, which are usually total conversions bringing back things from previous games of the series, fun mods, which add some new units to the game but without changing the gameplay of the game radically, crazy mods, which add nothing more than total craziness to the game, balancing mods, which work like patches and finally game-mods, which are total conversions and have units and story of their own.