This document discusses social stratification and related concepts. It defines social stratification as the division of society into hierarchical social groups. The main forms of social stratification are discussed as caste, class, and race. Caste is described as hereditary and arising from Hindu scriptures, while class is based on economic factors and race is biological. The document outlines features of the Indian caste system historically and today. It also discusses social mobility, social classes, and the influence of stratification on health.