1. Public international law, which governs the relationship between states and international organizations. It includes the following specific legal field such as the treaty law, law of sea, international criminal law and the international humanitarian law.
2. Private international law, or conflict of laws, which addresses the questions of (1) in which legal jurisdiction may a case be heard; and (2) the law concerning which jurisdiction(s) apply to the issues in the case.
3. Supranational law or the law of supranational organizations, which concerns at present regional agreements where the special distinguishing quality is that laws of nation states are held inapplicable when conflicting with a supranational legal system.

The two traditional branches of the field are:

• jus gentium — law of nations
• jus inter gentes — agreements among nations

• UN International Law: http://www.un.org/law/
• International Law Center: http://law.lexisnexis.com/practiceareas/international
• International law overview: http://topics.law.cornell.edu/wex/international_law
• Centre for International Law (CIL), Singapore: http://www.cil.nus.edu.sg/