The Supreme Court is the highest court in the US judicial system. It has the final say on interpreting the Constitution and federal law. Below the Supreme Court are the lower federal courts and state courts, which together form a dual court system. Cases can be heard in either federal or state courts depending on the types of laws, parties, and jurisdictional issues involved. The Supreme Court has both original jurisdiction over a few specific types of cases and appellate jurisdiction to review cases from lower courts. Its key powers include judicial review and establishing precedents through its rulings.