What is the function of the Audi A4's active lane assist system?

I am considering purchasing an Audi A4 and noticed that it comes equipped with an active lane assist system. What exactly does this system do and how does it enhance the driving experience?

The active lane assist system in the Audi A4 uses a camera and sensors to detect and monitor lane markings on the road. It can then assist in keeping the vehicle within its designated lane by making slight steering corrections.

Not only does the active lane assist system help keep the car in its designated lane, but it also provides a smooth and comfortable driving experience by reducing driver fatigue and minor steering corrections.

I find the active lane assist system in the Audi A4 particularly helpful on long highway drives. It helps to reduce stress and allows for a more relaxing and enjoyable ride.