they are norms of society (behaving in ways which are considered normal) that were taught to behave like that by institutions (institutions can be school, family, friends etc.)
enforced by internalization and sanctions....
Rules and behavories we are expected to know are called the unspoken rules.
a norm is a specific guide to behaviour in particular situations; it is the normal way to react/behave
"The norm" is simply "normal", but is stretched to mean "the average", "the mean value" or "the most common".
the rules of behavior in a society. Norm means Normal Normal - al = norm