Appellate court procedures are the rules and processes that govern how appeals are handled in higher courts after a trial has taken place. These procedures are crucial for ensuring that legal errors made during the initial trial can be reviewed and corrected, often focusing on issues of law rather than fact. They involve the submission of briefs, oral arguments, and the evaluation of the trial record, aiming to uphold justice by providing a mechanism for review in cases of wrongful convictions or exonerations.