What does the Audi A1's start-stop system do?

I've heard that the Audi A1 has a start-stop system. What does this system do and how does it work?

The start-stop system in the Audi A1 automatically turns off the engine when the vehicle is stationary and restarts it when the driver releases the brake pedal. This helps to reduce fuel consumption and emissions, making it more environmentally-friendly.

The Audi A1's start-stop system works by using sensors to detect when the car has fully stopped and the engine can be turned off. When the driver takes their foot off the brake, the engine instantly restarts so that the car is ready to accelerate again.

The start-stop system in the Audi A1 is especially useful for city driving or in heavy traffic, as it helps to save fuel and reduce emissions. It can also improve the overall lifespan of the engine by reducing wear and tear from constantly idling at traffic lights.