A1 Grand Prix, abbreviated to A1GP, is an open-wheel auto racing series. It is unique in its field in that competitors represent their nation as opposed to a constructor, which is traditional in most formula racing series including Formula One. As such, it is often promoted as the World Cup of Motorsport. The series is ratified and regulated by the Fédération Internationale de l'Automobile (FIA), and races (collectively known as A1GP World Cup of Motorsport) are held in the traditional Formula One off season, the northern hemisphere winter.