Okay, imagine we are playing music together, like a fun band. Normally, there might be a person in front called the conductor who helps everyone play at the same time. But sometimes, there's no conductor at all!
In this case, one person in the band can 'take the lead.' This means they help everyone know when to start playing and when to keep the beat. It’s like being the team captain. For example, if we are playing drums, the drummer might tap their drum slowly to show everyone when to play.
So, everyone is watching that one person who is helping them, and because of that, they can all play together nicely, just like how we all dance to a song together!