What are the different between cart and f1 cars?

Champ Car, a shortened form of "Championship Car", has been the name for a class of cars used in American Championship Car Racing for many decades. It is also the common name for the Champ Car World Series, an Open Wheel World Championship mainly based in North America that was formerly known as CART, or Championship Auto Racing Teams. The series was formerly known as the CART PPG IndyCar World Series and the CART FedEx Championship Series.