National security refers to a nation's measures to protect its citizens, economy, institutions, and overall interests from various threats. It is the duty of a government to ensure the security and defense of its sovereign state. While originally focused on military defense, the concept has broadened to include non-military aspects such as terrorism, crime, economic stability, energy, environment, food, and cybersecurity.
National security encompasses both internal and external threats. It requires a comprehensive approach involving defense, intelligence, diplomacy, law enforcement, and economic stability. Various elements contribute to national security, including military, political, economic, environmental, and energy aspects. Ensuring national security may involve political, economic, and military power, as well as diplomacy. National security also requires international cooperation to address transnational issues such as climate change, economic inequality, and nuclear proliferation.