So, imagine you're playing with your toys and one of your friends takes a toy that belongs to you without asking. You might ask them to give it back, but if they don't listen, you might need to ask an adult for help.
A bailiff is like an adult who helps people in court. They are responsible for making sure everyone follows the rules and behaves well during a trial or hearing.
Sometimes, if someone has been accused of something and they are in court, the judge might give an order. This order is like a really important direction that everyone has to follow. The bailiff's job is to make sure that everyone follows the order.
For example, the judge might say "No one is allowed to talk out of turn during this trial." If someone starts talking when they shouldn't, the bailiff might say "Order in the court!" as a reminder. Or, if someone doesn't leave the courtroom when they are supposed to, the bailiff might ask them to leave by saying "Please exit the courtroom."
Overall, a bailiff's job is to make sure everyone is safe and follows the rules during a trial or hearing. They are kind of like a referee in a game, except instead of watching over sports players, they are watching over people in a courtroom.