What is the Audi A4's Quattro system and how does it work?

I've heard about the Quattro system on the Audi A4, but I'm not sure what it really does. Can someone explain the technology behind it and how it enhances the car's performance?

The Quattro system is Audi's signature all-wheel drive technology. It uses a center differential to distribute power between the front and rear wheels, allowing for improved traction and handling in all weather conditions. As a happy owner of an Audi A4, I can say that the Quattro system really does make a difference, especially in snowy or rainy conditions.