“international law” is defined as “law between nations (States),” which stem from agreements, embodied in a treaty, or customs that is recognized by all nations, sources of international law, in order of precedence, are: (a) international conventions (treaties); (b) international custom, as evidence of a general practice accepted as law; (c) the general principles of law recognized by civilized nations; and (d) judicial decision and the teachings of the most highly qualified publicists of the various nations.
National law, which is often referred to as domestic law, are those laws that exist “within” a particular nation (State). National laws are also recognized as the expression of the State itself, since it emanates from the local authority, which could be the law making institution, such as the United States Congress or the French Parliament. In some States, called States with a common law tradition, laws could also come from decisions made by judges, which is also called case law. Other States, called States with a civil law tradition, do not recognize judge made law, but only laws enacted by the legislature.