How does the Quattro all-wheel drive system work in the Audi A8 car?

I've heard that Audi's Quattro all-wheel drive system is a major selling point for their cars. Can someone explain how it works and what makes it better than other all-wheel drive systems?

The Quattro all-wheel drive system in Audi A8 cars utilizes a center differential to distribute power evenly between the front and rear wheels. This allows for better traction and handling in various road conditions.