The phenomenon of thermoregulation refers to the process by which organisms maintain a stable internal body temperature despite external temperature fluctuations. This is crucial for optimal metabolic function and includes mechanisms like sweating, shivering, altering blood flow, and behavioral adaptations. Endothermic organisms, like mammals, actively regulate their temperature internally, while ectothermic organisms rely on environmental sources. Proper thermoregulation is essential for survival and homeostasis.