Champ Car, an abbreviation of "Championship Car", has been the name for a class and specification of cars used in American Championship Car Racing for many decades. It is also commonly used to refer to the Champ Car World Series, an international open-wheel championship based largely in North America and formerly known as Championship Auto Racing Teams, or CART. Under the CART organization the series was officially known as the CART PPG IndyCar World Series and later, the CART FedEx Championship Series.