The Federal Court System is a part of the United States judiciary that handles cases involving federal laws, disputes between states, and cases involving citizens from different states. It consists of three main levels: the District Courts, which are the trial courts; the Circuit Courts of Appeals, which review decisions made by the District Courts; and the Supreme Court, which is the highest court in the land and has the final say on legal interpretations. Each level of the Federal Court System has specific roles. The District Courts hear most federal cases, while the Circuit Courts focus on appeals. The Supreme Court reviews cases of significant constitutional or federal importance, ensuring that laws are applied consistently across the country.