1. Informal guideline about what is considered normal (what is correct or incorrect) social behavior in a particular group or social unit. Norms form the basis of collective expectations that members of a communityhave from each other, and play a key part in social control and social order by exerting a pressure on theindividual to conform. In short, "The way we do things around here." 
2. ... Read more

USAGE EXAMPLE

When someone deviates from the norm, they will draw attention to themselves, because their actions are so different than what everyone else is doing.