The U.S. Courts system is part of the federal government and is responsible for interpreting and applying the law. It consists of three main levels: District Courts, which are the trial courts; Circuit Courts of Appeals, which review decisions made by the District Courts; and the Supreme Court, the highest court in the land. Each level plays a crucial role in ensuring justice and upholding the Constitution. The Supreme Court has the authority to make final decisions on important legal issues and can overturn laws that it finds unconstitutional. Cases can be brought to the federal courts when they involve federal laws, disputes between states, or issues that cross state lines. This structure helps maintain a fair legal system across the country.