How does the Audi A4's Quattro system improve handling and driving performance?

I am considering purchasing an Audi A4 and have heard about their Quattro system. How does this technology work and how does it enhance the driving experience? I am looking for specific technical details and examples.

The Quattro system in the Audi A4 uses sensors to constantly monitor the road surface and distribute power to the wheels accordingly. This allows for increased traction and stability, especially in adverse weather conditions such as rain or snow. In my personal experience, the Quattro system has greatly improved the handling of my Audi A4 on wet roads.