Foreign law is the law of jurisdictions outside of one's own. As an academic concept and research field, it encompasses the systematic study, analysis, and comparison of legal systems, rules, and principles originating beyond the researcher's domestic jurisdiction. Key characteristics include cross-jurisdictional analysis and comparative methodology, investigating the structure, substance, and practical application of diverse external legal norms. This field holds significance for understanding global legal diversity, informing domestic legal development, and facilitating international legal practice and scholarship.