This book is a systematic review of the variety of forms of hypnosis found in everyday human life. At the same time, hypnosis does not seem to be some particular phenomenon that exists along with many other mental states, but one of the main mental system-forming factors not only in the life of an individual, but also in society as a whole. In a popular form, ideas about the nature and properties of hypnosis and suggestion, which were expressed at different times by individual researchers, are generalized, brought to logical formulations and supplemented by the author's own concepts. This information can greatly facilitate the understanding of the characteristics of human mental activity and thereby serve as a justification for the corresponding psychohygienic actions.