The concept of knowledge is ubiquitous, but knowledge as a phenomenon is still a mystery. In modern society, knowledge is extolled, but rarely tried to understand explain. In everyday life, knowledge dissolves into routine practices, institutions, and social roles. We rarely distinguish between "knowledge of" and "knowledge of how" and, in principle, are ready to leave the problems of knowledge at the mercy of science and technology. But if you try to look at knowledge as a social process? What aspects of knowledge come to the fore? Where do we find knowledge and what role does it play in the formation of modern society? This book bridges the gap between abstract philosophy and the everyday role of knowledge, tracing the history of the formation of the concept of knowledge in the social sciences and its place in various spheres of public life.