What does the EDrive button do on a BMW i8?

I recently purchased a BMW i8 and noticed that there is a button labeled EDrive. What does this button do and how does it affect the car's performance?

The EDrive button allows you to switch between electric-only mode and the hybrid mode in the BMW i8. When in electric-only mode, the car runs solely on the battery, while in hybrid mode the engine and battery work together.

Using the EDrive button wisely can help you conserve your battery life and achieve better fuel efficiency. If you're driving longer distances, it's better to switch to hybrid mode to conserve battery for later use.