Final appealable order refers to an order that is final and from which appeals can be profferred. The general rule is that orders entered during the course of a pending case are not appealable until the entire case has been resolved. This principle is commonly known as the "final judgment rule," and it provides that earlier rulings that were interlocutory when entered can be appealed at the conclusion of the case if they remain relevant at that point.
Federal Rule of Civil Procedure 54(b) is one of several established exceptions to the final judgment rule. Rule 54(b) provides that if a case involves separate claims for relief or multiple parties, a federal district court can certify as final an order disposing of at least one claim as to at least one party even if other claims remain against that party or against other parties in the case.