Reparation means saying sorry when you did something wrong and trying to make it right or better. The Virgin Mary is a very important person in the Christian religion. She is believed to be the mother of Jesus. People who love Mary and believe in her power may do things to ask for her forgiveness or help. This is called an act of reparation. It can be a prayer or a special action, like giving money to charity or doing something good for someone else. When we do acts of reparation to Mary, we are saying we are sorry and trying to make things better.