" Humans " is a kind of animal that have the highest development in comunication and sociality. To be together in a community or social, the variety of human's behavior make us face many problem. That's why we must have the rules. Rule is A authoritative statement of what to do or not to do in a specific situation, issued by an appropriate person or body. It clarifies, demarcates, or interprets a law or policy. This is the definition from the dictionary. In my opinion rule is the regulation that we must follow. If we not do or followed them we will get punishment from social or law. So what is the most important rules in our society? I think the most important rule is about the privacy. Human is really social animal, but human also need the privacy. If we respect privacy of others, respect the social, respect ourselves. I think our social will have more peace.