In a world that constantly preaches the importance of success and self-promotion, we often forget the invisible threads that bind human relationships: courtesy, respect, and mutual understanding. These are not laws written in any constitution, but they often speak louder than formal rules. Social norms and unspoken codes of conduct quietly shape how others perceive and respond to us. Here are seven such social rules that, while rarely spoken about, can have a profound impact on your personal and professional life.