Irony may be pided into categories such as verbal, dramatic, and situational。 Verbal irony is a contradiction between a statement’s stated and intended meaning; Situational irony means the disparity of intention and result, when the result of an action is contrary to the desired or expected effect。 Dramatic irony is a disparity of awareness between an actor and an observer: when words and actions possess significance that the listener or audience understands, but the speaker or character does not, for example when a character says to another “I'll see you tomorrow!” when the audience (but not the character) knows that the character will die before morning。 It is most often used when the author causes a character to speak or act erroneously, out of ignorance of some portion of the truth of which the audience is aware。 

      Successful irony helps reflect its rhetorical aims in an implicitly way, consists of three important elements, namely contrast of opposing extremes, confident sense of detachment and distance, and non-narrative rhetorical insertion in his/her novel。 It is pided from satire in that satire is a way of criticizing a person, an idea or an institution to show their faults or weakness directly。 Irony’s sense boundary is constantly expanded with irony techniques and devices becoming constantly broadened。 Irony is an inherent quality in Vanity Fair。