Open-wheel car describes cars with the wheels outside the car's main body and, in most cases, one seat. Other names include formula car, single-seater car in British English, or Indy car in the United States. Open-wheel cars are different from street cars, sports cars, stock cars, and touring cars. These car have their wheels below or inside the body or fenders. Open-wheel cars are usually built just for racing. Often, they have a higher amount of technological sophistication than in other forms of motor racing.