Federal law is the body of law created by the national government of a federal system, including statutes enacted by the national legislature, regulations issued by executive agencies, and decisions of national courts. As a research concept and academic field, it investigates the sources, interpretation, application, and impact of these laws, their relationship with state or provincial legal systems, their constitutional foundation, and their role in regulating matters of national concern such as interstate commerce, civil rights, and national security; its study is significant for understanding the structure and function of national governance and the legal framework governing interactions across constituent states or provinces.