How does the function of the stop/start system in the Audi A4 work?

I am curious how the stop/start system in the Audi A4 works and whether it actually saves fuel or causes engine wear. Can someone explain it in simple terms?

The stop/start system in Audi A4 is designed to save fuel by automatically turning off the engine when the car is stationary and then restarting it when the gas pedal is pressed. However, it can also cause engine wear and tear due to frequent startups. To minimize this, it is recommended to turn off the system when driving in heavy traffic.

The Audi A4's stop/start system is powered by a high-tech mechanism that uses sensors to detect when the car is stopped and automatically turns off the engine. When the brake pedal is released, the engine starts up again. This feature can save fuel, but it also puts extra stress on the car's battery and starter motor.

The stop/start system in Audi A4 is activated through the Brake Energy Recuperation feature, which stores energy that would otherwise be lost during braking. This energy is then used to restart the engine, reducing fuel consumption. However, it is advised to turn off the system in extreme weather conditions as it may put additional strain on the battery.