What does the 'quattro' system do on an Audi A6?

I'm considering purchasing an Audi A6, but I'm not sure what the 'quattro' system does. Can someone explain it to me?

The 'quattro' system is Audi's all-wheel drive system. It distributes power to all four wheels, providing better traction and handling in various driving conditions.

I absolutely love the 'quattro' system on my Audi A6. I feel much more confident driving in snow and rain because of it. I highly recommend it.

The 'quattro' system is a must-have for anyone living in a climate with inclement weather. It gives you better control and stability on slippery roads.