Show Closing/Ticket Refund Question

After years of being a fan from afar, I'm finally able to afford tickets and travel, but I was wondering about this issue. If one buys tickets for a show on Broadway for several months out, and the show ends up closing before the date of the performance you bought tickets for, are you entitled to/guaranteed a refund? I know you typically can't get a refund if you can't make the show, but I've never thought about the inverse where the show closes.

Okay, cool, and thank you very much! I figured there might be a policy if one purchased direct through the two major services; I try and avoid third-party unless something is absolutely sold out anyways. Thanks again, aasjb4ever!