What is the purpose of the turbocharged engine in the Audi A3?

I've heard that the Audi A3 has a turbocharged engine, but I'm not sure why or what that means for the car's performance. Can someone please explain it to me?

The purpose of a turbocharged engine in the Audi A3 is to improve the power and performance of the car. By compressing and delivering more air into the engine, the turbocharger allows for more efficient combustion, resulting in increased horsepower and torque.

A turbocharged engine in the Audi A3 is also more efficient, as it allows for smaller engine sizes while still providing the power of a larger engine. This can lead to better fuel economy and lower emissions.