Public international law concerns the structure and conduct of states and international organizations. To a lesser degree, international law also affects multinational corporations and individuals, an impact increasingly evolving beyond domestic legal interpretation and enforcement. Public international law has increased in use and importance vastly over the twentieth century, due mainly to the increase in global trade, armed conflict, environmental deterioration on a worldwide scale, human rights violations, rapid and vast increases in international transportation and a boom in global communications.
See more at Wikipedia.org...