What is the difference between Audi's quattro AWD and other AWD systems?

I've heard that Audi has a unique AWD system called quattro. How is it different from other manufacturers' AWD systems?

Quattro stands apart from other AWD systems because it uses a permanent all-wheel drive instead of a part-time system, providing better traction and stability in all driving conditions.

Unlike many AWD systems that primarily focus on distributing power to the front and rear wheels, quattro also distributes power between the left and right wheels, resulting in improved handling and cornering.

Quattro uses a center differential to distribute power between the front and rear wheels, which can adapt to different driving conditions and distribute power accordingly. This makes it more efficient and responsive compared to other mechanical AWD systems.