QUESTION: What is Irony?
ANSWER: Irony is a device by which a writer expresses a meaning contradictory to the stated or ostensible one. There are many techniques for achieving irony.
Example:  When that the poor have cried, Caesar hath wept
Ambition should be made of sterner stuff;
Yet Brutus says he was ambition,
And Brutus is an honourable man.
[Shakespeare: Julius Caesar]
 Hamlet: So long? ….. O heavens! die two
Months ago and not forgotten yet? Then
There's hope a great man's memory
may outlive his life half a year.