This document provides an overview of sociolinguistics and discusses key concepts from seminal researchers in the field. It summarizes Basil Bernstein's theory of restricted and elaborated codes, explaining how working-class children may be disadvantaged by their habitual use of restricted code. It also summarizes Shirley Brice Heath's research comparing literacy practices and bedtime stories in three American communities, finding that middle-class children were better prepared for school due to experiences that mirrored classroom activities. The document concludes that the work of Bernstein and Heath suggests social class is fundamentally important in education, as schooling privileges certain literacy practices and types of knowledge associated with middle-class communities.