An alcohol-free zone means a special area where grown-ups are not allowed to drink alcohol. When people drink alcohol, it can make them act differently, and sometimes not in a safe way. That's why some places, like schools or parks, have a special rule that doesn't allow grown-ups to drink alcohol in that area. This is to help keep everyone safe and make sure that everyone can have fun without worrying about people acting weird or getting hurt. When you see a sign that says "alcohol-free zone," it means that grown-ups have to follow this rule and not drink alcohol in that area.