What is the function of the Audi A4 quattro all-wheel drive system?

I've heard a lot about the Audi A4 quattro all-wheel drive system, but I'm not sure what it does. Can you explain it to me in simple terms?

The Audi A4 quattro all-wheel drive system is a sophisticated powertrain that distributes torque between the front and rear axles. In normal driving conditions, it primarily powers the front wheels for better fuel efficiency. However, when the system detects loss of traction, it can send up to 70% of the power to the rear wheels for better grip and control.

In short, the Audi A4 quattro all-wheel drive system helps improve overall performance and handling in various road and weather conditions. It allows for better acceleration, cornering, and stability, making the driving experience more enjoyable and safe.