What is Audi's Active Lane Assist technology?

I've heard about Audi's Active Lane Assist, but I'm not sure what it does or how it works. Can someone explain it to me?

Audi's Active Lane Assist is a feature that uses cameras and sensors to detect the lane markings on the road and help keep your vehicle within those lines. It provides subtle steering assistance and even gentle braking to help keep you centered in your lane, making highway driving more stable and less fatiguing.

I've been using Audi's Active Lane Assist for a few months now and I have to say, it's been a game changer. Not only does it keep me from unintentionally drifting out of my lane, but it also provides a sense of reassurance and safety on long drives.