This handbook provides a comprehensive survey of the development and importance of the North Atlantic Treaty Organisation (NATO), its role in international relations and its influence on history. To present an inclusive study of the Alliance's activities and milestone events and to offer a glimpse of future challenges, the book's 29 chapters fall into six thematic sections that act as frameworks and allow the exploration of specific topics that pertain to the evolution of NATO: Part I: History of NATO, 1949-2024; Part II: Key Enduring Themes, 1949-2024; Part III: Military Operations, 1995-2024; Part IV: National Perspectives, 1949-2024; Part V: Regional Perspectives, 1949-2024; Part VI: Future Prospects, 2024-.