Cell respiration is a vital process that occurs in the cells of living organisms, allowing them to convert nutrients into energy. This process primarily involves the breakdown of glucose in the presence of oxygen, producing ATP (adenosine triphosphate), which serves as the energy currency of the cell. The main stages of cell respiration include glycolysis, the Krebs cycle, and the electron transport chain. During cell respiration, cells also release carbon dioxide and water as byproducts. This process is essential for maintaining life, as it provides the energy required for various cellular activities, including growth, repair, and reproduction.