How does the Nissan Leaf's electric engine work?

I've heard that the Nissan Leaf is fully electric, but I'm not sure how the engine works. Can someone explain?

The Nissan Leaf's electric engine uses an electric motor powered by its lithium-ion battery pack. It converts the energy from the battery into mechanical energy to power the car.

Unlike traditional gas engines, the Nissan Leaf's electric engine has fewer moving parts and is more efficient. Plus, you won't have to worry about oil changes or other maintenance costs.