What is Audi A4's Quattro all-wheel drive system and how does it work?

I've heard about the Quattro all-wheel drive system in Audi A4's but I'm not entirely sure how it works. Can someone explain it to me?

The Quattro all-wheel drive system in Audi A4's is designed to provide optimal traction and handling in various road conditions. It uses a center differential to distribute torque between the front and rear axles, constantly adjusting power based on the available grip on each wheel.

In simpler terms, the Quattro all-wheel drive system in Audi A4's allows for power to be sent to all four wheels, rather than just the front or rear. This results in improved stability, traction, and performance on slippery or uneven roads.