Why does the Audi A6 have a Quattro system?

I've been looking at the Audi A6 and I've noticed that it has a Quattro system. Can you explain what this is and how it benefits the car's performance?

The Quattro system is Audi's all-wheel drive system that distributes power to all four wheels for improved traction and handling. This is especially useful in adverse weather conditions or when driving on rough terrain.

Having all-wheel drive also means that power is evenly distributed, reducing the risk of wheel slippage and allowing for better acceleration. This can be especially beneficial for high-performance models of the Audi A6.