The acronym DRS in Formula 1 stands for Drag Reduction System. It is a driver- activated aero device that briefly opens a flap in the rear wing to reduce aerodynamic drag, increasing top speed on straight sections and aiding overtaking. The system is restricted to designated activation zones on each circuit and can only be used when a driver is within one second of the car ahead at a detection point. DRS was introduced in 2011 to improve overtaking opportunities, and it typically operates in dry conditions with restrictions during wet races.