The process of cellular respiration is essential for producing the energy required for cellular functions. During cellular respiration, cells break down glucose and other nutrients in the presence of oxygen to generate ATP, the primary energy currency in living organisms. This process not only provides energy for metabolic activities such as growth, repair, and maintenance but also produces byproducts, including carbon dioxide and water. Understanding cellular respiration is crucial for grasping how organisms obtain and utilize energy to sustain life.