Discourse analysis is the study of language beyond the sentence level and how it is used in context. It draws from various disciplines like linguistics, psychology, and sociology. Early influential figures included Zellig Harris who studied linguistic elements in extended texts and Dell Hymes who examined speech in social settings. Models have been developed to analyze spoken discourse in contexts like classrooms and conversations. Discourse analysis also examines written texts and interprets patterns and relationships within and across texts. It aims to understand how language functions in real-world social and cultural contexts.