An annulment is when the court declares that you were never legally married.
In Massachusetts, there are very few reasons that you can get an annulment, and the court requires clear proof of the reason why you want the annulment. An annulment makes it as if a marriage never happened, while a divorce ends a valid marriage. An annulment isn't easier or faster to get than a divorce. An annulment that's granted by the court is not the same as a religious annulment.