Mitochondria, often referred to as the powerhouses of the cell, play a critical role in energy production. These double-membraned organelles are responsible for generating adenosine triphosphate (ATP), the primary energy currency of the cell, through a series of biochemical reactions known as oxidative phosphorylation. Understanding the basic functions of mitochondria is crucial, especially when exploring the potential benefits of compounds like Pyrroloquinoline Quinone (PQQ), which has gained attention for its role in mitochondrial function and overall health.