Transplant surgery is when doctors take an organ, like a heart or a kidney, from one person and put it into another person who needs it because their organ is not working properly.
Think of it like a puzzle: sometimes one person has a puzzle piece that the other person needs to complete their puzzle. The doctors take the "puzzle piece" or organ from the person who has extra or no longer needs it and put it into the person who is missing that "puzzle piece" or organ.
Transplant surgery is a very big procedure so the doctors make sure that the person getting the new organ is healthy enough to receive it and that the new organ is a good match. This means that the new organ fits well into the person's body so it works the way it should.
After the surgery, the person getting the transplant needs to take medicine to make sure their body doesn't reject, or fight against, the new organ. The person will also need to be checked by the doctors often to make sure everything is okay.
Transplant surgery can save many lives and improve the quality of life for those who receive the new organ. It is important to take care of our bodies so that we can help others who may need our "puzzle piece" someday.