The Celtic League is a group of people from different countries who come together to talk about how they can work together and make things better for the people who live in their countries. These countries are Scotland, Ireland, Wales, the Isle of Man, Brittany, Cornwall, and Galicia.
You know how you have friends who you play with and work together on things like building a sandcastle or playing a game? Well, the Celtic League is like a group of friends who work together to help their countries.
They talk about how they can get more money to make schools better or how they can help protect the environment so that animals can live safely in their homes. They also talk about how they can make sure people are treated fairly no matter where they live.
It's kind of like learning to share your toys and play nicely with others, but instead, they are making decisions that can affect lots of people's lives.