In Act 2 Scene 2 of Hamlet, Polonius believed that Hamlet had gone mad. However, the audience knows the real situation of things. Hamlet was simply pretending to be mad.
Dramatic irony is a type of irony in which the audience knows the truth behind a character's behavior even though the other characters in the story may not know this.
We find an example in act 2 of Hamlet where Polonius thought that Hamlet was mad whereas, the audience knew the truth.
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