What does the ECO Drive button do in the Kia Stonic?

I recently bought a Kia Stonic and noticed a button labeled ECO Drive. What exactly does this button do and how does it affect my driving experience?

The ECO Drive button optimizes your driving experience to be more efficient and eco-friendly.

When activated, the ECO Drive button adjusts the transmission and engine to consume less fuel.

By pressing the ECO Drive button, the vehicle's performance is adjusted to reduce emissions and save energy.