To study ideology is to ask such questions as: Where do our ideas about society and politics come from? Are these ideas socially determined? If so, what validity can they claim? In this brief yet comprehensive introduction, David McLellan examines the origins of the concept of ideology, analyzes its place in the Marxist and non-Marxist traditions, and assesses the various uses to which it has been put in recent social and political theory, particularly the connection between ideology and the "end of history" debate. Revised and updated, this second edition is for all those who are interested in a clear presentation of the most basic concept in the philosophy of the social sciences.