The vagueness doctrine is a rule that says laws or regulations can't be written in a way that is unclear or confusing. Imagine if someone told you to clean your room, but they didn't give you any specific instructions on what to clean or where to put things. You wouldn't know if you did the job correctly or not because the request was too vague. Well, laws can be the same way. They have to be written in a way that people can understand what behavior is expected of them, or what behavior is not allowed. The vagueness doctrine helps to ensure that laws aren't written in a way that is too confusing or unclear for people to follow. It's like a teacher who makes sure everyone in the class understands the instructions before starting an assignment. Everyone needs to be on the same page to be successful.