What is Audi's all-wheel-steering system and how does it improve driving performance?

I heard that Audi's A8 model has an all-wheel-steering system. Can you explain how it works and what benefits it brings to the overall driving experience?

Audi's all-wheel-steering system allows the rear wheels to turn in the opposite direction of the front wheels at low speeds, resulting in a tighter turning radius and easier maneuvering in tight spaces.

At high speeds, the all-wheel-steering system turns the rear wheels in the same direction as the front wheels, providing better stability and control.