The Supreme Court of Illinois is the highest court in the state of Illinois. It was established in 1818 and is responsible for overseeing the judicial system in the state. The court has seven justices who hear cases involving state law, including appeals from lower courts. The justices are elected to ten-year terms, and their decisions can significantly impact Illinois law and society. The court also has the authority to regulate the practice of law in the state and to discipline attorneys. Its headquarters is located in Springfield, Illinois.