WoW takes place just four years after the real-time strategy Warcraft series, which chronicles a 25 year struggle between the Alliance (humans, dwarves, gnomes, and elves) and the Horde (orcs, tauren, trolls, and undead). Even though there's tons of accumulated story to the series, new players should not be daunted. The background is there for you to explore, but you don't have to tread a lot of Azeroth history to get into the action.