What is Audi A1's auto start-stop feature and how does it work?

I've heard that the Audi A1 has a unique auto start-stop feature but I'm not sure how it works or if I should be using it. Can you explain it to me?

The auto start-stop feature in the Audi A1 is designed to save fuel and reduce emissions by automatically turning off the engine when the car is stopped in traffic or at a red light. This feature can also be manually turned off if desired without affecting the overall performance of the vehicle.

When the car is stopped, the auto start-stop system will detect if the engine can be safely switched off. It will then turn off the engine and restart it as soon as you release the brake pedal or press the accelerator. This seamless process helps improve fuel efficiency and reduce emissions.