How does the quattro permanent all-wheel drive system improve the driving experience in the Audi A5?

I've heard a lot about the Audi quattro permanent all-wheel drive system, but I'm not really sure how it works and what benefits it offers. Can someone please explain it to me and how it enhances the performance of the Audi A5?

The quattro permanent all-wheel drive system in the Audi A5 distributes power efficiently and dynamically between all four wheels, providing better traction and stability on all types of road surfaces and driving situations.