European union law is the distinctive legal order and associated academic discipline concerning the European Union. This field investigates the sources, principles, institutions, and application of law within the EU framework, including its interaction with national legal systems, its impact on policy areas, and its role in transnational governance. Key characteristics include its sui generis nature, the principles of direct effect and supremacy, and its significance in facilitating economic and political integration among member states and shaping the rights and obligations of individuals and entities within the Union.