Social classes are economic or cultural arrangements of groups in society. Class is an essential object of analysis for sociologists, political scientists, economists, anthropologists and social historians. In the social sciences, social class is often discussed in terms of 'social stratification'. In the modern Western context, stratification typically comprises three layers: upper class, middle class, and lower class. Each class may be further subdivided into smaller classes (e.g. occupational).— Excerpted from Social class on Wikipedia, the free encyclopedia.