This document discusses social class and its relationship to sociolinguistics. It defines social class as a measure of social organization based on various social attributes like occupation, income, wealth, and aspirations. Social class theory divides classes into workers and those who control production. Classes can experience downward or upward mobility. Language differs between social classes, and status is determined by factors like occupation and income that can group people into socioeconomic classes. Changes in language can come from above through prestige forms, or from below through internal linguistic changes, and different social groups may lead each type of change.