Description: Acclimatization is the process by which an organism adjusts to a change in its environment, allowing it to survive and thrive under initially adverse conditions. This phenomenon can occur in response to variations in environmental factors such as temperature, altitude, humidity, atmospheric pressure, and resource availability. Acclimatization involves a series of physiological, morphological, and behavioral adaptations that enable the organism to optimize its functioning in the new context. Unlike adaptation, which is an evolutionary process occurring over generations, acclimatization is a more immediate and reversible adjustment. This process is crucial for the survival of many species, especially in extreme environments, and can influence the geographical distribution of organisms. Acclimatization is observed not only in individual organisms but can also have implications for entire populations, affecting their dynamics and evolution. In summary, acclimatization is a vital mechanism that allows living beings to face and adapt to changes in their environment, ensuring their continuity and well-being in a constantly changing world.