The sociology of scientific knowledge (SSK) is the study of science as a social activity, especially dealing with "the social conditions and effects of science, and with the social structures and processes of scientific activity." The sociology of scientific ignorance (SSI) is complementary to the sociology of scientific knowledge. For comparison, the sociology of knowledge studies the impact of human knowledge and the prevailing ideas on societies and relations between knowledge and the social context within which it arises.

The sociology of knowledge is the study of the relationship between human thought, the social context within which it arises, and the effects that prevailing ideas have on societies. It is not a specialized area of sociology. Instead, it deals with broad fundamental questions about the extent and limits of social influences on individuals' lives and the social-cultural basis of our knowledge about the world. The sociology of knowledge has a subclass and a complement. Its subclass is sociology of scientific knowledge. Its complement is the sociology of ignorance.