This document discusses social stratification systems. It defines social stratification as the hierarchical arrangement that categorizes individuals into social classes based on factors like wealth, power, and prestige. It notes that stratification is universal but varies between societies. Key characteristics of stratification systems discussed are that they persist across generations through concepts of social mobility, are influenced by a society's beliefs, and can be open or closed depending on opportunities for social class advancement. The document also presents functionalist, conflict, and symbolic interactionism perspectives on social stratification.