Social stratification refers to a society's hierarchical arrangement of individuals and groups according to factors like wealth, income, occupation, education, and social prestige. It involves the classification of people into categories with varying access to resources and power. Major forms of stratification include primitive communalism, slavery, caste systems, and estates. Stratification exists due to various viewpoints including natural inevitability, structural functionalism, conflict theory, and symbolic interactionism. Stratified systems have characteristics like social rankings that can change, life experiences that depend on social category, and slow changing social ranks over time.