What is the difference between the Audi A8's standard 4-wheel drive and Quattro drive systems?

I am considering purchasing an Audi A8, but I am confused about the differences between the standard 4-wheel drive and Quattro drive systems. Can someone explain this to me in more detail?

The standard 4-wheel drive system in the Audi A8 is a permanent all-wheel drive system, meaning power is delivered to all four wheels at all times for increased grip and stability. Alternatively, the Quattro drive system uses a dynamic torque distribution that constantly adjusts power to individual wheels, providing even better traction and handling in various driving conditions.

In simple terms, the standard 4-wheel drive system in the Audi A8 is like having four equally strong hands gripping onto the road, while the Quattro drive system is like having four hands of varying strengths that can adapt to different scenarios for maximum control and performance.