Social class refers to the stratification of different groups based on power, economic wealth, social wealth and cultural wealth. While Marxists talk about two main social classes (the bourgeoisie, or ruling class, and the proletariat, or working class) sociologists measure class in a number of different ways. While some talk about upper, middle and working class, others use classifications such as AB, C1, C2, DE, etc or a numbering system, based on people's occupations.