Populism is a contested concept, used to refer to a variety of political stances that emphasize the idea of the "common people" and often position this group in opposition to a perceived elite. It is frequently associated with anti-establishment and anti-political sentiment. The term developed in the late 19th century and has been applied to various politicians, parties, and movements since that time, often assuming a pejorative tone. Within political science and other social sciences, several different definitions of populism have been employed, with some scholars proposing that the term be rejected altogether.