How does the start-stop system work in the Audi A2?

I've heard that the Audi A2 has a start-stop system, but I'm not sure how it actually works. Can someone explain it to me in simple terms?

The start-stop system in the Audi A2 helps reduce fuel consumption and CO2 emissions by automatically shutting off the engine when the car is at a complete stop, like at a red light or in traffic. When you release the brake pedal, the engine restarts quickly, allowing for smooth acceleration.

The start-stop system is also known as 'smart idle' because it intelligently detects when the car is at a complete stop and turns off the engine. This helps save fuel and also reduces wear and tear on the engine. It's a great feature to have in an urban environment with a lot of stop-and-go traffic.