Or Dawn of War, which is the best 40K video game, also Total War might be becoming a series for warhammer.
Warhammer is a tabletop miniature wargame. What's a Wargame you ask? I'm glad you might have, it's a game where you and an opponent (Or maybe a group of opponents the game can have any number of players larger than 2) where you move models around the board, and try and kill your enemies models. There is a secondary aspect to the hobby, where you buy model kits and assemble/paint them so you may play them in game.
Which Game? (It should say somewhere on the front)