Appellate Law is a branch of law that deals with the review of decisions made by lower courts. When a party believes that a trial court made an error in its ruling, they can appeal the decision to a higher court. The appellate court examines the case based on the record from the lower court, focusing on legal arguments rather than new evidence. The process involves submitting written briefs and, in some cases, presenting oral arguments. Appellate courts aim to ensure that the law was applied correctly and that the rights of the parties were upheld during the original trial.