Those verbs have different consequences. To affirm is to leave the judgment in place. To reverse is to conclude that the lower result was legally wrong and direct the appropriate different result. To vacate removes the judgment or order's legal effect, often so the matter can be reconsidered. To remand sends the case back for specified additional work, such as applying the correct test or holding further proceedings. An appellate court can combine these actions, which is why "the appellant won" may not tell a beginner what happens next.

The kind of issue matters. An appellate court independently reviews legal conclusions but ordinarily gives greater respect to supported factual findings because the trial court managed the evidence and observed the witnesses. If credibility determined a finding, appellate judges do not recall the witness and conduct a second trial. If the district court used the wrong legal test, however, correcting that legal error is central to appellate review.

An appeal is not a general request for a better outcome. A party identifies an alleged error in the proceedings or judgment and explains why it matters. Regional circuit precedent binds district courts within that circuit unless controlling Supreme Court law requires otherwise. The Federal Circuit differs because Congress gave it specialized subject-matter jurisdiction rather than one geographic region. Further review by the full circuit or Supreme Court is possible in limited circumstances, not automatic after every panel decision.

The common distractor describes an appellate panel deciding which witness was more believable after hearing fresh testimony. That is ordinarily trial work. Look instead for briefs, a record, a claimed legal error, and a remedy directed to the lower court.

Video lesson: Structure of the Court System: Crash Course Government and Politics #19