Discourse analysis involves studying language beyond the sentence level, including conversations and written texts. There are various approaches to discourse analysis from different fields like sociology, linguistics, and philosophy. Sociological approaches include conversational analysis which examines turn-taking, openings/closings of conversations. Systemic functional linguistics views language as evolving based on its social functions and analyzes texts in relation to social contexts. Critical discourse analysis considers how power and social domination are reproduced through language.