Synopsis Defence has been of prime importance to every nation-state since times immemorial. With the advancement of science and technology to defend the national territory from the armed aggression of enemy countries has become easy on the one hand and complex and challenging on the other. Nuclear and laser weapons, supersonic fighting planes, ballistic missiles, remote sensing defence techniques; use of satellites and many other sophisticated defence devices have changed the entire scenario of conventional defence strategy. The present book discusses India's defence strategies and challenges with facts and figures. National Security and defence; Security environment; Foreign affairs; Organizational functions; and Defence policy are elaborately discussed in this book.