"How does Audi's active lane assist technology work in the A7?"

I've heard that Audi's A7 has the ability to keep the car in its lane, but I'm not sure how this technology actually works. I'm curious to know the technical details behind it.

Audi's active lane assist technology uses a camera and sensors to detect lane markings and constantly monitors the car's position in the lane. If the car starts to drift out of the lane without the turn signal being activated, the system will gently steer the car back into the center of the lane. As someone who has driven the A7, I can say it's a great feature that makes highway driving much more relaxed.