Why is the mitochondria of a cell import?

Since we know that mitochondria is a powerhouse, what it can do is that it helps living organisms like humans and what it does is it generates most of it from ATP (adenosine triphosphate) which it separates itself in glucose into an energy.

“Mitochondria are tiny double membrane-bound organelles found in almost every cell of all organisms except bacteria. Known as the “powerhouse of the cell” they are primarily responsible for converting the air we breathe and the food we eat into energy that our cells can use to grow, divide and function.”