Topic summary
Cultural norm

Extracted from the Wikipedia article Social norm.
Social control
As social beings, individuals learn when and where it is appropriate to say certain things, to use certain words, to discuss certain topics or wear certain clothes, and when it is not. Thus, knowledge about cultural norms is important for impressions, which is an individual's regulation of their nonverbal behavior. One also comes to know through experience what types of people he/she can and cannot discuss certain topics with or wear certain types of dress around. Typically, this knowledge is derived through experience (i.e. social norms are learned through social interaction). Wearing a suit to a job interview in order to give a great first impression represents a common example of a social norm in the white collar work force.