The Supreme Court of the United States is the highest court in the federal judiciary of the United States. It was established by Article III of the United States Constitution and has ultimate jurisdiction over all federal and state courts in the country. The court is composed of nine justices, including a Chief Justice who is currently John Roberts. The other eight justices are associate justices. The Supreme Court's main function is to interpret and apply the laws of the United States, including the Constitution, and to resolve disputes between different branches of government, between states, and between individuals and the government. The court's decisions are final and cannot be appealed.