Norm are the rules, standards, and expectations of behaviour that are widely shared and understood within a society or group, guiding the actions and interactions of its members and defining what is considered acceptable, appropriate, and desirable in various social situations. Norm can be formal, such as laws and written rules with specific sanctions for violations, or informal, such as customs, traditions, and social etiquette that are maintained through social approval or disapproval. They provide a framework for social order and cohesion, helping individuals to anticipate how others will behave and to know how they themselves are expected to act. Norm vary across cultures and can change over time within a society, reflecting evolving values and beliefs.