Why does the Audi A4 have start-stop technology?

I've noticed that the Audi A4 has a start-stop technology feature. Can you explain how it works and the benefits of having it in this car?

The start-stop technology in the Audi A4 is designed to improve fuel efficiency and reduce emissions. When the car is idling, such as at a stop light, the engine shuts off automatically to conserve fuel. As soon as you release the brake pedal, the engine restarts seamlessly. This helps save on gas and ultimately, reduces your carbon footprint.