The Federal courts of the United States comprise of, as a whole, the Judiciary Branch, one of the three branches of U.S. Federal Government, alongside the Executive and Legislative Branches.
A Federal court can come in one of several different categories. In this regard, U.S. Federal courts can come in the form of a trial court, such as a U.S. district court. Moreover, U.S. Federal courts also include the 13 empowered with appellate jurisdiction.
The Supreme Court of the United States is considered the Federal Court of last resort, in that it primarily exercises appellate jurisdiction over the rest of the U.S. court system at both the State and Federal level. In limited cases, the court can wield original jurisdiction, allowing it to originate legal proceedings. Moreover, U.S. Federal courts can also be set up to exercise either original or appellate jurisdiction over various areas of law