The document discusses different definitions and characterizations of discourse. It defines discourse as (1) a set of terms, metaphors, and ways of talking that constitute an object, and (2) an exchange in talk or text that performs social actions. It also distinguishes between "big D" discourse, which refers to general ways of viewing the world, and "small d" discourse, which refers to actual language use. The document provides examples of toxic discourse from literature and analyzes how discourse is used to accomplish different social actions in interaction.