What is the most advanced technology used in the Audi A4's engine?

I am considering buying an Audi A4 and I have heard that its engine is one of the most advanced on the market. What specific technology does it use and how does it enhance the car's performance?

The Audi A4 uses a turbocharged engine that incorporates variable valve timing technology, allowing for optimal fuel efficiency and increased power output.

The engine in the Audi A4 employs a direct fuel injection system, which improves responsiveness and reduces emissions. Furthermore, it works in conjunction with the car's start-stop system for even greater efficiency.