What does the 'ECO' button do in the Vauxhall Insignia?

I noticed a button with the label 'ECO' in my Vauxhall Insignia and I am wondering what its purpose is. Can someone explain?

The 'ECO' button in the Vauxhall Insignia stands for Economy mode. It reduces fuel consumption by optimizing the engine and transmission performance. It is recommended to use it during long-distance drives or in heavy traffic.

Activating the 'ECO' mode can also improve the overall driving experience by reducing engine noise and vibrations. However, keep in mind that it might slightly decrease the car's acceleration.

I've noticed that using the 'ECO' mode also changes the air conditioning settings to conserve energy. This can help save fuel but might make the cabin less comfortable in hot weather.