What does the Fuel Stratified Injection (FSI) system in the Audi A4 do?

I've come across the term 'FSI' multiple times while researching the Audi A4. What exactly does this system do and how does it contribute to the overall performance of the car?

The FSI system in the Audi A4 is a direct fuel injection technology that delivers fuel directly into the combustion chamber of the engine. This allows for a more precise fuel delivery, resulting in improved fuel efficiency and performance.

In simple terms, the FSI system in the Audi A4 ensures that the fuel is delivered to the engine in the most efficient way possible, resulting in better fuel economy and overall engine performance.

The FSI system in the Audi A4 also helps to reduce emissions by achieving a more complete combustion of the fuel. This means that the car is more environmentally friendly without sacrificing performance.