The name of the process that produces ATP in cells is called cellular respiration. This metabolic process occurs primarily in the mitochondria, transforming nutrients, particularly glucose, into ATP, the main energy currency of cells. Cellular respiration involves several stages, including glycolysis, the Krebs cycle, and the electron transport chain. During glycolysis, glucose is broken down into pyruvate; then, in the Krebs cycle, energy carriers like NADH and FADH₂ are produced. Finally, the electron transport chain generates ATP through oxidative phosphorylation. This energy production is vital for cellular functions, growth, and maintaining homeostasis in living organisms.