Informal Norm are unwritten and unspoken rules or expectations of behaviour that guide everyday social interactions and customs within a society or social group, distinct from formal, codified laws or regulations. These norms are learned implicitly through socialisation, observation, and social interactions, and they are enforced through informal social control mechanisms such as social approval (e.g., smiles, praise) or disapproval (e.g., frowns, gossip, ridicule, ostracism) from family, friends, peers, and community members. Informal norms cover a vast range of social conduct, from manners and etiquette (folkways) to more morally significant customs (mores) that are considered essential for maintaining social order and cohesion. While not legally binding, violations of informal norms can still lead to social discomfort, embarrassment, or exclusion. They play a crucial role in shaping individuals' daily behaviours, maintaining social predictability, and defining acceptable conduct within various social contexts.