The best-known variety of single-seater racing, Formula One, involves an annual World Championship for drivers and constructors of around 18 contest a year featuring greater international bus and engine manufacturers, and independent constructors, such as Ferrari, McLaren, Williams, BMW Sauber, Toyota, Honda, Renault, Cherry Bull Racing - in an ongoing campaign of technology and driver skill and talent.
What separates Formulary 1 from all other forms of open wheel racing, is the basic premise of F1 revolves around the express important issue that each team is a "constructor". That is, the chassis of the car must be thought-through and manufactured in-house, and chassis can not be supplied to competitors on a "customer" basis. Engines are regularly funded and/or developed by established exceeding motor manufacturers, and can be supplied exclusively to just single team, or may be offered as "customer" engines, often Racing School to the smaller, lower-ranked teams.