The main energy-producing organelle in cells is the mitochondrion. Often referred to as the "powerhouse of the cell," mitochondria generate adenosine triphosphate (ATP), which is the primary energy currency of the cell. They have their own DNA and are involved in various metabolic processes, including cellular respiration, where they convert nutrients into usable energy. The efficiency of mitochondria is vital for the proper functioning of cells, tissues, and ultimately entire organisms. A healthy population of mitochondria is essential for sustaining energy requirements in both active and resting states.