Organ regeneration is the process by which certain organisms can repair or replace damaged or lost organs. This ability is most commonly observed in species like axolotls and starfish, which can regrow limbs and other body parts. Scientists study these organisms to understand the mechanisms behind regeneration, hoping to apply this knowledge to human medicine. In humans, organ regeneration is limited, but research is ongoing in areas like stem cell therapy and tissue engineering. These fields aim to develop techniques that could help regenerate damaged organs, potentially leading to new treatments for conditions like heart disease or liver failure.