Throughout history, taboos have been considered social rules rooted in people's fears of things seen as dangerous, contaminated, or sacred. Across different cultural settings, prohibitions related to sexuality, bodily practices, ritual conduct, death, food, and sacred spaces have played an important role in organising collective life and preserving symbolic boundaries. Rather than treating taboos solely as religious restrictions or irrational customs, this paper approaches them as culturally transmitted systems shaped by emotional response, symbolic classification, and social reinforcement. Drawing upon perspectives from symbolic anthropology, cognitive anthropology, and moral psychology, the discussion reveals how fears concerning impurity, contamination, and uncertainty become attached to systems of prohibition and gradually acquire moral and sacred authority. Particular attention is given to the relationship between ritual practice, emotional reinforcement, and the preservation of communal order. Examples including menstrual restrictions, ritual abstinence before hunting, food prohibitions, and avoidance practices associated with death reflect how taboo systems regulate both social behaviour and collective perceptions of purity and danger. Contemporary forms of moral policing, symbolic contamination, and public condemnation within digital culture also demonstrate the continuing relevance of taboo-like structures in modern society. By examining the interconnections among fear, contamination, and sacred prohibition, this study suggests how taboo systems persist and acquire long-term cultural authority across historical and social contexts.