An organ donor is a person who voluntarily gives their organs or tissues for transplantation after death or, in some cases, while still alive. This process helps save or improve the lives of individuals suffering from organ failure or severe medical conditions. Common organs donated include the heart, kidneys, liver, and lungs. In many countries, individuals can register as organ donors through government programs or health organizations. The decision to become an organ donor is often made in consultation with family members, and it is important to communicate one's wishes clearly. Successful transplants can significantly enhance the quality of life for recipients.