societies run on social norms (accepted behaviours within society)
deviation is if a person behaves in a way that deviates from social norms and they are seen as abnormal
in the UK it is a norm to queue in a shop and wait your turn. If someone walked into a shop and skipped the queue, then this would be regraded as abnormal behaviour
a social norm is an unwritten rule about what is acceptable within a particular society.
A person is seen as abnormal if they violate the social norms