Audi's QUATTRO technology is a patented technology unique to Audi. Simply put: quattro? It can effectively distribute the power of the engine to the four wheels at all times, and cooperate with the Torsen mechanical central differential to ensure that all four tires have road grip.
for detailed features and working principle, please check: /tech/index.html
There are detailed explanations and explanations and differences from ordinary four-wheel drive.