What is the Quattro system on the Audi A5 and how does it work?

I've heard that the Audi A5 has a Quattro system but I'm not sure what it actually does or how it works. Can someone explain it to me in simple terms?

The Audi A5's Quattro system is an all-wheel drive system that helps improve traction and handling while driving. It does this by distributing power to all four wheels, allowing for better control on different road surfaces and in various weather conditions. As for how it works, it monitors wheel slippage and adjusts power delivery accordingly.