Land, air, and naval defense refers to the military strategies and systems used to protect a nation from threats. Land defense involves ground forces, such as soldiers and tanks, that secure borders and respond to attacks. Air defense includes fighter jets and missile systems that protect against aerial threats, ensuring the safety of the skies. Naval defense focuses on protecting a country's waters using ships, submarines, and naval aircraft. This branch of defense is crucial for maintaining control over sea routes and deterring maritime threats. Together, these three components create a comprehensive defense strategy to safeguard a nation's sovereignty.