What is the difference between Audi A4 Quattro and S4?

I am interested in purchasing an Audi A4, but I am unsure of the difference between the Quattro and S4 models. Can you please clarify?

The Audi A4 Quattro and S4 are both all-wheel drive sedans that offer superior performance and handling. However, the S4 is a higher trim level and comes with a more powerful engine and additional luxury features such as leather seats and a sport-tuned suspension.

The Quattro and S4 models of the Audi A4 both have the same base engine, but the S4 has been tuned for increased horsepower and torque. The S4 also has a more aggressive exterior design and a more advanced suspension system for better handling.

The main difference between the Quattro and S4 models of the Audi A4 is in their performance capabilities. The S4 has a more powerful engine and is better suited for driving enthusiasts, while the Quattro offers a more balanced and comfortable driving experience.