Imagine you are at a big party with all your friends, and you want to decide what game to play next. Now, instead of everyone voting for a game, you all gather in a small group and talk about what game you should play.
This is kind of like a caucus. It's when a group of people who belong to the same political party get together to talk about who they want to be the leader of the party. They talk about the things they like and don't like about the candidates, and try to convince other people to support the candidate they like the most.
Some caucuses take place in people's houses or community centers, while others happen in big rooms like a gymnasium. They can be a fun way to share your opinion and see if you can convince others to agree with you.
At the end of the caucus, everyone votes for their favorite candidate and the winner is decided. This helps the political party decide who they want to support for elections.