How does the Audi A3 implement its quattro all-wheel drive system?

I've heard a lot about the quattro all-wheel drive system in Audi cars, but I'm not sure how it actually works. Can someone explain the mechanics behind it and how it differs from other AWD systems?

The Audi A3 utilizes a center differential to distribute power between the front and rear axles, allowing for better traction and stability in all driving conditions. One advantage of this system is that it can send up to 85% of power to the rear wheels if needed, giving a more sporty and responsive driving experience.