How does the automatic start/stop function work in an Audi A4?

I'm curious about how the engine in an Audi A4 can automatically turn off and on by itself. Is there a special mechanism or technology involved in this process?

The automatic start/stop function in an Audi A4 uses a feature called 'idle-stop'. This shuts off the engine when the car is idling or stopped, saving fuel and reducing emissions. The engine will restart once the driver starts to accelerate.