Transplantation is the transfer (engraftment) of human cells, tissues or organs from a donor to a recipient with the aim of aiding and restoring function(s) in the body.
You may need an organ transplant if one of your organs has failed. This can happen because of illness or injury. When you have an organ transplant, doctors remove an organ from another person and place it in your body. The organ may come from a living donor or a donor who has died.