This document discusses social stratification and the concepts of social class, status, social desirables, and social mobility. It defines social stratification as a society's categorization of people into socioeconomic layers based on occupation, income, wealth, status, and power. There are generally considered to be three main social classes: the upper class, middle class, and lower class. Status refers to one's position in the social hierarchy, and can be ascribed based on attributes like gender or achieved through education and career. Social mobility refers to movement between social classes, which can occur through either horizontal movement within a class or vertical movement between classes in open or closed class systems.