The Executive branch, led by the President, is like the CEO of the country. They make sure the laws passed by Congress are actually enforced, kind of like a principal making sure the school rules are followed. The President also gets to appoint judges and other important officials, which is a big deal!
The Judicial branch, comprised of the Supreme Court and other courts, is like the referee of the country. They interpret the laws and make sure they align with the Constitution, which is like the ultimate rulebook. If someone thinks a law is unfair, they can take it to court and let the judges decide!