What is the purpose of the start-stop system in an Audi A1?

I've heard that the Audi A1 has a start-stop system, but I'm not sure why it's there. Can someone explain its purpose and how it works?

The start-stop system in the Audi A1 is designed to reduce fuel consumption and emissions by automatically shutting off the engine when the car is at a standstill. This helps to save fuel during stop-and-go traffic or when idling at a stoplight.

In addition to reducing fuel consumption, the start-stop system also helps to reduce wear and tear on the engine and starter motor.

To work properly, the start-stop system relies on a variety of sensors and systems in the car, including the battery, engine temperature, and brake pressure. If any of these components are not functioning properly, the system may not work effectively.