How does the start-stop system in Audi A1 work?

I recently purchased an Audi A1 and I have noticed that it has a start-stop system. Can you explain how this system works and if it has any benefits?

The start-stop system in Audi A1 works by automatically shutting off the engine when the car is at a stop, such as in traffic or at a red light. This can improve fuel efficiency and reduce emissions.

When you release the brake and press the gas pedal, the engine quickly starts back up. This system can help save on gas and reduce noise pollution.