Federal judges are appointed officials who serve in the United States federal court system. They are responsible for interpreting and applying federal laws, ensuring justice is served in cases that involve federal statutes, constitutional issues, or disputes between states. Federal judges can serve for life, unless they resign, retire, or are removed through impeachment. There are different levels of federal judges, including district court judges, circuit court judges, and Supreme Court justices. Each level has specific responsibilities, with district court judges handling most federal cases, circuit court judges reviewing appeals, and Supreme Court justices making final decisions on significant legal questions.