As “post” means “after”, then  post Judgment are any matters pursued or which come up “after” a final Judgment is entered in a case.  Every initial dissolution or paternity action must have a Judgment entered to finalize the case.

Post Judgment matters can also be a modification of a court Order issued after the  final Judgment is entered.

Post judgment matters are usually requested modifications of any of the Court’s orders that are specifically set forth in a party's  Judgment of Dissolution of Marriage or Judgment Re Paternity (or other Judgment), or in an Order filed following the entry of the Judgment.

Should a party not abide by the orders set forth in their Judgment, then the Judgment may need to be enforced by the other party which is also deemed a post judgment matter