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

I've heard about Audi's Quattro all-wheel drive system, but I'm not sure what it actually does and how it works. Can someone explain it in simple terms?

Audi's Quattro all-wheel drive system is a unique feature that distributes power to all four wheels, providing better handling and traction on various road surfaces. It also enhances the car's stability and control, especially in adverse weather conditions.

While most cars are either front-wheel or rear-wheel drive, Audi's Quattro system is constantly monitoring driving conditions and sends power to the wheels with the most grip, improving performance and safety.