What is quattro all-wheel drive on an Audi A6?

I've heard that the Audi A6 has quattro all-wheel drive. What does this feature do and how does it improve the car's performance?

Quattro all-wheel drive is a permanent all-wheel drive system that distributes power to all four wheels for improved traction and handling. In the Audi A6, this means better acceleration, cornering, and overall control on different road surfaces.

As a proud Audi A6 owner, I can say that quattro all-wheel drive has saved me from getting stuck in ice, snow, and mud several times. It's a great option to have for all-weather driving.