What is Audi A7's active lane assist feature?

I was looking at the specifications of the Audi A7 and noticed it has an active lane assist feature. What exactly is this feature and how does it work?

Audi's active lane assist feature uses a camera to monitor road markings and keep you centered in your lane. It can also gently steer the vehicle to keep you from drifting off course.

Active lane assist is essentially a safety system that alerts you when you are drifting out of your lane and can even adjust the steering to keep you in your lane.