Incomplete question. I provided an explanation about irony in literature.
<u>Explanation:</u>
Situational Irony is a literary device used by an author to express <u>an action in the plot of a story that is totally different from what the reader would expect.</u>
For example, a protagonist (the leading character) in a story with so much life in one story unexpectedly and tragically died. This is ironic because the reader would naturally expect the protagonist to save the day.