The United States federal court system is a structured network of courts that interprets and applies federal laws. It consists of three main levels: the U.S. District Courts, which are the trial courts; the U.S. Courts of Appeals, which review decisions from the district courts; and the U.S. Supreme Court, the highest court that oversees the entire system. Each level serves a specific purpose, ensuring that justice is administered fairly. The federal courts handle cases involving federal laws, disputes between states, and cases involving citizens from different states. This system helps maintain the rule of law across the nation.