This document defines and distinguishes between three main types of irony used in literature: verbal irony, dramatic irony, and situational irony. Verbal irony occurs when a speaker says something but means something else. Dramatic irony happens when the audience knows something that characters do not. Situational irony involves a reversal of expectations. The document provides examples of each type, such as Jonathan Swift's satirical proposal to eat children in A Modest Proposal as verbal irony and the dramatic irony in Romeo and Juliet when Juliet appears dead but is actually alive. It also distinguishes irony from sarcasm, noting sarcasm involves expressing annoyance rather than serving a literary purpose.