Positivism is a philosophical theory which states that "genuine" knowledge (knowledge of anything which is not true by definition) is exclusively derived from experience of natural phenomena and their properties and relations. Thus, information derived from sensory experience, as interpreted through reason and logic, forms the exclusive source of all certain knowledge. Positivism therefore holds that all genuine knowledge is a posteriori knowledge.
Positivism also holds that society, like the physical world, operates according to general laws. Introspective and intuitive knowledge is rejected, as are metaphysics and theology because metaphysical and theological claims cannot be verified by sense experience. Although the positivist approach has been a recurrent theme in the history of western thought, the modern approach was formulated by the philosopher Auguste Comte in the early 19th century. Comte argued that, much as the physical world operates according to gravity and other absolute laws, so does society.