Why does the Audi A6 use a Quattro system?

I've always been curious about the reason behind Audi's decision to use the Quattro all-wheel drive system in their A6 models. Can someone explain the technical advantages of this system?

The Audi A6 uses the Quattro system because it greatly improves the car's handling and performance, especially in adverse weather conditions. The all-wheel drive system distributes power to all four wheels, allowing for better traction and stability on the road.