Cellular regeneration is the process by which cells in the body repair or replace themselves. This occurs naturally in many tissues, allowing organisms to heal from injuries and maintain healthy function. For example, skin cells regenerate quickly to heal cuts, while liver cells can regenerate after damage. In some organisms, such as axolotls and starfish, cellular regeneration is more advanced, allowing them to regrow entire limbs or body parts. Research into cellular regeneration aims to understand these processes better, with potential applications in medicine, such as improving wound healing and developing treatments for degenerative diseases.