After an individual or corporation has its their heard case heard by a trial-level or other lower court, the case can be further appealed or reviewed. That’s where the appellate or appeals court comes in. It is a higher level court at the federal and state levels. There are 13 federal appellate courts and one for each state.
Appellate court does not have a jury. Individuals or corporations with a judgement against them can have the case heard in appellate court. The appellate court will ensure that the law was applied correctly in the original hearing. If the case is overturned, the judgement is dropped, as the appellate court takes precedence over the ruling of the lower court.