Annulment is a process where instead of being divorced, the marriage is treated as if it had never taken place.
Although duration of marriage is not a factor in determining if annulment may be granted, annulments are most common when the couples have not been married for very long. An annulment may limit one’s ability to share in the marital estate or to obtain alimony.
Examples of grounds for annulment include bigamy, incest, under age marriage, failure to consumate the marriage, etc. Please check your state laws for the gounds that apply to your State.