This document discusses the key concepts of social class, status, and sociolinguistics. It defines social class as the grouping of people according to their status and membership in societies, while status refers to the social positions and prestige assigned by a society to its members. It outlines how sociolinguistics studies the relationship between linguistic variation and social factors like class, gender, age, and how variables take on prestige or stigma depending on their social meanings and associations. The document also discusses concepts like overt and covert prestige, restricted vs elaborate codes, markers and indicators, and the relationship between social mobility, class, and language use.