This document provides an overview of key concepts related to social stratification and class structure. It discusses several bases for social stratification including wealth, income, social class, ethnicity, gender, religion, and political status. It also distinguishes between open and closed stratification systems. Key thinkers discussed include Karl Marx, Max Weber, and their analysis of class structure. Marx viewed society as divided between the bourgeoisie and the proletariat, while Weber emphasized differences between class, status, and power and identified four main social classes.