This document provides an overview of critical discourse analysis (CDA). It defines CDA as the study of written and spoken language use to reveal social sources of power and inequality. The document outlines the theoretical origins of CDA in Western Marxism and discusses three influential models: Norman Fairclough's dialectical-relational approach examines text, processes of production/interpretation, and social conditions; Teun van Dijk's socio-cognitive approach analyzes the interaction of cognition, discourse and society; and Ruth Wodak's discourse-historical approach was developed in sociolinguistics and focuses on large research programs of language use related to issues like racism.