What is the difference between quattro and all-wheel drive in the Audi A8?

I am considering purchasing an Audi A8 and am curious about the different types of all-wheel drive systems they offer. I know that Audi is known for their quattro technology, but what sets it apart from their other all-wheel drive systems?

Quattro is Audi's signature all-wheel drive system and is found in most of their models, including the A8. It uses a torsen center differential to distribute power between the front and rear axles, providing better traction and handling in various driving conditions.