What is Audi's All-Wheel Steering System?

I've heard that Audi has an all-wheel steering system, but I'm not sure how it works or why it's important. Can someone explain it to me?

The Audi all-wheel steering system works by allowing the rear wheels to turn slightly in the same direction as the front wheels. This improves stability and maneuverability at high speeds, and makes parking easier and more precise.

I've found the all-wheel steering system to be particularly helpful in tight city driving situations. It provides more agility and makes it easier to navigate narrow streets and tight corners.