Public comment is like when you are in class and your teacher asks you a question, and you raise your hand to answer. But instead of just answering in class, you get to speak your thoughts and ideas to important people who make decisions that affect lots of people.
For example, let's say the government is deciding whether or not to build a new playground near your house. They will ask for people to give their opinions and ideas about the playground, and anyone who wants to can send in a public comment.
When you want to give a public comment, you can write it down or say it out loud. It's important to be respectful and say what you think clearly and calmly. The people who read or hear your comment will listen to what you say and take your ideas into consideration when they make their decision.
Public comments help make sure that everyone's ideas and opinions are heard, and that the people in charge make the best decision possible.