How does the Audi A1's variable valve timing work?

I've heard that the Audi A1 has an advanced engine with variable valve timing. Can anyone explain how this feature works and what benefits it provides?

Basically, Audi's variable valve timing system adjusts the timing of the valves in the engine to optimize performance and fuel efficiency. At lower speeds, the valves open and close quickly for better fuel economy, and at higher speeds they open wider for more power.