What is the purpose of the Automatic Start-Stop feature in the Audi A4?

I've noticed that my Audi A4 has an automatic start-stop feature, but I'm not sure what it's for. Can you explain its purpose and how it works?

The Automatic Start-Stop feature is designed to improve fuel efficiency by turning off the engine when the car is stationary, such as at a traffic light or in traffic. It then automatically restarts the engine when you release the brake and press the gas pedal.

This feature can also reduce emissions and wear on the engine, as it prevents unnecessary idling. It may take some getting used to, but it can save you money on gas in the long run.