There is no single organization called "National Security Law." Instead, "National Security Law" refers to a broad and dynamic field of legal practice and academic study that governs how governments protect their citizens, manage intelligence, conduct military operations, and respond to threats in both the physical and digital worlds. This field is critical for businesses and technology companies, especially those operating in sectors like cybersecurity, defense, telecommunications, and international trade. National Security Law encompasses a wide range of legal areas, including intelligence law (such as the Foreign Intelligence Surveillance Act, or FISA), military law, border security, cyber operations, export controls, and emergency powers. It also addresses the balance between individual liberties and government authority, particularly in times of crisis or conflict. The National Security Agency (NSA), for example, operates under legal authorities like FISA and National Security Directive 42, which guide its cybersecurity and intelligence missions. Historically, national security law has evolved in response to global events, from World War II and the Cold War to the post-9/11 era and the rise of cyber threats. Key achievements include the establishment of legal frameworks for intelligence oversight, the development of international agreements on arms control and conflict management, and the creation of specialized courts and review boards. Today, national security law is more relevant than ever, as governments and businesses grapple with issues like data privacy, cyberattacks, foreign investment reviews, and the regulation of emerging technologies. Academic programs, law firms, and government agencies continue to shape this field, ensuring that legal standards keep pace with technological and geopolitical changes. For those in business and technology, understanding national security law is essential for compliance, risk management, and strategic decision-making.