The European Committee of the Regions is like a big group of people who represent different regions and cities from all over Europe. Think of a big team with lots of members from different places!
Their job is to help make important decisions about how things should be done in Europe. They do this by giving their opinions and advice to the European Union. Just like you might ask a grown-up for advice when you don't know what to do, the European Union asks this group of people for advice when they need help making important decisions.
This group also helps to make sure that the voices of the different regions and cities in Europe are heard. They want to make sure that everyone's opinions and ideas are considered when decisions are being made. So, it's kind of like a big team of grown-ups who work together to make sure everyone's ideas are heard and important decisions are made fairly.