When most couples decide to part ways, they get a divorce, but an extremely small subset instead obtain annulments. However, a marriage may only be annulled if it is void or voidable. The two, despite their obvious similarities, are very different categories, and to state that your marriage falls under one when in fact, it is the other, can cause problems down the line.
In Illinois, an annulment is referred to as a judgment of invalidity and may be granted to those in void or voidable marriages. It is important to understand that they are not granted in the same manner as a divorce might be. Void marriages, under Illinois law, are those where the union was invalid from the beginning. Illinois law recognizes three major situations in which a marriage qualifies as void: bigamy, consanguinity, and incest. Generally, if a relationship goes against public policy or is generally against the law, it will be held to be void. Criminal charges may also result in extreme circumstances, but this is very rare.