Discourse analysis refers to studying language use beyond the sentence level, including conversational exchanges and written texts. There are several approaches to discourse analysis from different disciplines. These include speech act theory (language as action), conversation analysis (structure of dialogue), interactional sociolinguistics (context and social identities), ethnography of communication (culture and communication), pragmatics (meaning based on context), and variation analysis (linguistic structures in texts). Each approach provides a distinct perspective for analyzing discourse in social contexts.