Okay, so collegiality is when the people who work in the same job (like priests, bishops, and the Pope) work together like a team. They talk to each other and make decisions together to help the Catholic Church. It's like when you play a game with your friends, you have to work together to win. That's what the people in the Catholic Church do too, they work together to help everyone who goes to the church. Think of it like a big family, they all have to help each other out to make the family happy and successful.