A criminal appeal is a legal process where a person convicted of a crime asks a higher court to review the decision made by a lower court. The appeal focuses on potential errors in the trial, such as improper evidence admission or incorrect jury instructions, rather than re-evaluating the facts of the case. During the appeal, the convicted individual, known as the appellant, submits written arguments, and the prosecution responds. The higher court then decides whether to uphold the original verdict, reverse it, or order a new trial. This process ensures that legal rights are protected and justice is served.