What is the difference between Audi Quattro and Audi's other all-wheel drive systems?

I've heard about Audi's legendary all-wheel drive technology, but I'm confused about the different types. Can someone explain the differences between Audi Quattro and other all-wheel drive systems they offer?

Audi Quattro is the original all-wheel drive system by Audi, known for its superior performance and handling. It uses a standard torque split of 40:60 (front to rear) for a balance between agility and power. Other all-wheel drive systems offered by Audi, such as the Quattro Ultra, have different torque split ratios and may not provide the same level of performance as the original Quattro system.