This document discusses concepts related to community, society, social structure, social mobility, social class, and the relationship between social class and health. It provides definitions of key terms like community, urban and rural society, and social mobility. It also describes methods of measuring socioeconomic status like the Kuppuswamy scale and modified Kuppuswamy scale. Finally, it discusses how social class can impact health outcomes and the various factors like environment, access to services, education, and attitudes that contribute to social class differences in health.