In general, legal systems can be split between civil law and common law systems. The term "civil law" referring to a legal system should not be confused with "civil law" as a group of legal subjects distinct from criminal or public law. A third type of legal system—accepted by some countries without separation of church and state—is religious law, based on scriptures. The specific system that a country is ruled by is often determined by its history, connections with other countries, or its adherence to international standards. The sources that jurisdictions adopt as authoritatively binding are the defining features of any legal system. Yet classification is a matter of form rather than substance, since similar rules often prevail. (Source).