Macrometabolism refers to the complex biochemical processes that occur within an organism to sustain life. There are several synonymous terms for macrometabolism, including cellular metabolism, biological metabolism, or simply metabolism. These processes involve nutrient uptake, breakdown, and energy release for cellular function and growth. Metabolism is further divided into catabolism and anabolism, where catabolism involves the breakdown of complex molecules to release energy, and anabolism involves the building of complex molecules for growth and repair. The metabolic pathways differ in different organisms and can be used to identify them. The study of macrometabolism is crucial in understanding the molecular basis of life and how it operates in different organisms.