Formula 1 is the highest class of international auto racing. A Formula 1 season consists of a series of Grand Prix races held around the world that are used to determine the World Drivers' and Constructors' Championships. Formula 1 cars are the fastest regulated road-course racing cars owing to high aerodynamic downforce. There are 10 teams that field two cars each driven by contracted drivers over a race weekend consisting of practice sessions and a qualifying session to determine the starting grid for Sunday's race. Lewis Hamilton has won a record 7 World Drivers' Championships while Michael Schumacher holds the record for most race wins.