A rear spoiler, also known as a boot lid spike or simply a spoiler, is an automotive aerodynamic device that is designed to be mounted on the back of a vehicle. Its primary function is to reduce lift and drag by disrupting the airflow behind the car, which helps improve stability at high speeds and makes the car more responsive when turning or braking. In addition, rear spoilers can also enhance the appearance of vehicles, particularly sports cars and racing cars, giving them a sleeker and more aggressive look.