International law is the system of rules governing relations between sovereign states and relations between states and international organizations. Public international law concerns rights between nations, while private international law deals with legal issues involving citizens of different countries. National laws are designed to regulate human behavior within a state and generally fall into three categories: laws that forbid certain actions, laws that require compensation for injuries, and laws that specify requirements for certain activities like forming a company. The key differences between national and international law include their law making processes, enforcement mechanisms, and issues of state consent. National laws are made by legislatures and enforced through domestic courts, while international law relies more on state negotiation and public pressure.