Discourse analysis can be used in various fields including applied linguistics, conversation analysis, pragmatics, rhetoric, and text linguistics. It involves the systematic study of language structure and acquisition, and explores how language is used in communication and how social and cultural factors interact with language. Text linguistics describes and analyzes extended written or spoken texts in their communicative context, taking into account elements like form, context, and style. Discourse analysis studies actual language use including features like hesitations and non-standard forms, in order to better understand how language works in practice.