What is the difference between the Audi A5's Quattro and S-tronic systems?

I'm considering purchasing an Audi A5 but I'm unsure about the different drivetrain and transmission options. Can someone explain the differences between Quattro and S-tronic?

Quattro is Audi's trademark all-wheel drive system, providing better handling and traction in all weather conditions. S-tronic is Audi's name for their dual-clutch automatic transmission, offering faster gear shifts and better fuel efficiency.

Quattro and S-tronic are both available in the Audi A5 but they work together to enhance the driving experience. Quattro distributes power between the front and rear wheels, while S-tronic ensures smooth and efficient gear changes.