This document discusses the use of irony in Sophocles' play Oedipus Rex. It defines different types of irony: dramatic irony occurs when the audience knows something a character does not; verbal irony involves a character saying something untrue that they believe to be true; and situational irony involves outcomes that are opposite of what was expected. The document analyzes examples of each type of irony used in Oedipus Rex, such as Oedipus unknowingly fulfilling a prophecy through his own actions while believing he escaped his fate.