Profanity involves the use of notionally offensive words for a variety of purposes, including to demonstrate disrespect or negativity, to relieve pain, to express a strong emotion, as a grammatical intensifier or emphasis, or to express informality or conversational intimacy. In many formal or polite social situations, it is considered impolite, and in some religious groups it is considered a sin. Profanity includes slurs, but there are many insults that do not use swear words.

A taboo, also spelled tabu, is a social group's ban, prohibition, or avoidance of something based on the group's sense that it is excessively repulsive, offensive, sacred, or allowed only for certain people. Such prohibitions are present in virtually all societies. Taboos may be prohibited explicitly, for example within a legal system or religion, or implicitly, for example by social norms or conventions followed by a particular culture or organization.