What does the 'quattro' system do in Audi cars?

I heard that Audi cars have a 'quattro' system, but I have no idea what it does. Can you explain it to me?

The 'quattro' system is Audi's all-wheel drive system. It distributes power between the front and rear wheels, providing better traction and stability. It's especially useful in inclement weather or during spirited driving.

Audi's 'quattro' system uses a center differential to distribute power between all four wheels. This allows for better handling and control, even in slippery conditions.