The National Marrow Donor Program is a group of people who want to help others in need by giving them parts of their body called bone marrow. Bone marrow is a special part inside our bones that makes important cells that help keep us healthy. Sometimes, people get sick and their bone marrow stops working right. When this happens, doctors may need to find someone who has healthy bone marrow that matches the sick person’s bone marrow. That’s where the National Marrow Donor Program comes in. They keep a big list of people who are willing to donate their bone marrow if someone needs it. To be on the list, you have to be very healthy and willing to help others. If someone needs a bone marrow transplant, doctors can check the list to see if there is someone who is a good match for them. Then, that person can donate their bone marrow to help the sick person feel better and get healthy again. It’s a really special way to help others and make a big difference in someone’s life!