Brahmand World Defence Update 2021 aims at providing a comprehensive assessment of the present day global military order with a focus on each nation’s military capabilities, new arms acquisitions and defence spending. The tenth edition of the yearbook features a new chapter on Military Application of Artificial Intelligence (AI) of China, India, Israel, Russia, UK and USA. The special chapter promises to add fresh impetus to the book by focussing on major countries’ various radar technology and the latest advances of the Military systems. The yearbook also contains the latest information on defence capabilities of 113 countries and has highlighted 33 important countries with their geopolitical importance, internal and external conflict areas, threat perspectives, strategic relations, multilateral alliances, defence capabilities including strategic forces and defence deals.