Tattoos were once deviant. Now they are mainstream. Deviance refers to behavior that violates social norms, but norms shift. What one generation calls deviant, the next calls normal. Sociologists do not judge whether an act is inherently wrong. They ask how and why certain acts get labeled deviant, and who has the power to apply that label.

Emile Durkheim argued that deviance is functional. It clarifies moral boundaries, strengthens group solidarity, and can spark social change. Conflict theorists focus on power: laws and norms often protect the interests of dominant groups. Labeling theory, associated with Howard Becker, says deviance is not a quality of the act but a consequence of others' reactions.

Examples across categories

• Formal deviance: crime, punishable by law
• Informal deviance: rudeness, breaking a queue
• Victimless deviance: unconventional dress or lifestyle
• Innovative deviance: civil disobedience, whistleblowing

Not all deviance is negative. Artists, reformers, and entrepreneurs often violate norms to create something new.