An annullment, on the otherhand, is a statement by the tribunal that the marriage never actually existed. There are lots of reason this could be. For example, if one of the parties did not understand what was required in a Catholic marriage. (like they had no intention of being open to life from the very begining) Another common example would be if the marriage happened outside of the church and if one of the couple was not free to marry. Also, if one of the couple weren’t in their right mind at the time or were coerced because of family pressure or a pregnancy. These are examples of reasons why the Church will sometimes declare a marriage null. It isn’t the same thing as ending a valid marriage.