When writing an essay do you underline the title of a play?

Here's the proper format:

* Italicize the title of a play, book, movie, or other long work.

* Use quotation marks for the title of a short work like a poem, short story, or song.

So, for example, you would write:

* *Hamlet* (play)

* "The Raven" (poem)

This formatting guideline helps distinguish between different types of works.