Discourse analysis
Discourse analysis is related to text linguistics. However, text linguistics studies how discourse is structured so that they are connected (how sentences are joined to each other). Discourse analysis studies this, and also how the discourse is connected to the context. This context includes who the people talking or writing are, the social and cultural context. Also, it studies the way mode, which is the way the language is represented (is it a letter, speech, email, Internat chat?), influences discourse. Discourse analysis is also interested in the genre (topic) of the discourse.