How does the variable geometry turbo work in the Audi A1?

I am considering buying an Audi A1 as my next car, but I have heard about this concept of a variable geometry turbo. How does it work and what benefits does it offer?

The Audi A1's variable geometry turbo is a type of turbocharger that adjusts the height and direction of the turbine blades based on engine speed and load. This allows for better control of the air entering the engine, resulting in improved fuel efficiency and power output. It is a great technology for achieving a balance between performance and efficiency on the road.