International law governs relations between nations and addresses issues like territorial disputes, laws of war, and human rights. It primarily concerns relations between states rather than private citizens. States are only bound by international law if they consent to and agree to abide by it. International law includes public international law, private international law, and supranational law. The main sources of international law are treaties, customary practices, and general principles recognized by nations. Secondary sources include decisions of international courts and scholarly writings.