What is dynamic all-wheel steering in the Audi A6 and how does it work?

I've seen that the Audi A6 offers a feature called dynamic all-wheel steering, but I'm not sure what it is or how it works. Can someone explain it to me?

Dynamic all-wheel steering in the Audi A6 is a feature that allows the rear wheels to turn slightly in the opposite direction of the front wheels at lower speeds, making the car more agile and easier to maneuver. At higher speeds, the rear wheels turn in the same direction as the front wheels, making the car more stable and improving handling on curves and highways. In my experience, this feature has greatly improved the overall driving experience.