Organ donation involves removing organs or tissues from deceased or living donors for transplantation into other individuals. Key organs that can be donated include the heart, lungs, liver, kidneys, and pancreas. Legislation regarding organ donation varies by country, with some requiring explicit consent from donors and others assuming consent unless the donor explicitly dissents. There are ongoing ethical debates around issues such as defining death, ensuring informed consent, preventing financial exploitation of living donors, and addressing shortages in organ supply.