The Lady Chapel is a special part of a church dedicated to Mary, the mother of Jesus. It's kind of like a room within a bigger room, where people can go to pray or just be quiet and think. The Lady Chapel usually has lots of decorations and paintings that show Mary or other important people from the Bible.
Think of it like a special place in your own house where you might keep your favorite toys or dolls. You might decorate this place with pictures that are special to you or with things that remind you of the people you love. That's kind of like what the church does with the Lady Chapel. It's a special place to honor and remember Mary, who was a very important person in the story of Jesus.