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

I've noticed that my Audi A1's engine shuts off automatically when I come to a stop, and then starts again when I press the accelerator. What is this feature and how does it work?

The start-stop function is a feature that helps improve fuel efficiency by automatically turning off the engine when the car is stationary, such as at a stoplight. This reduces unnecessary idling and saves gas.

The start-stop function also reduces emissions and helps to improve air quality. When the engine is turned off, harmful pollutants are not being released into the environment.

To ensure a smooth start after a stop, the Audi A1's start-stop function is equipped with a regenerative braking system that charges the battery while the engine is off. This ensures that there is enough power to start the engine again when needed.