National security or national defense is the security and defense of a nation state, including its citizens, economy, and institutions, which is regarded as a duty of government.
Originally conceived as protection against military attack, national security is now widely understood to include also non-military dimensions, including the security from terrorism, minimization of crime, economic security, energy security, environmental security, food security, cyber-security etc. Similarly, national security risks include, in addition to the actions of other nation states, action by violent non-state actors, by narcotic cartels, and by multinational corporations, and also the effects of natural disasters.
Governments rely on a range of measures, including political, economic, and military power, as well as diplomacy, to safeguard the security of a nation-state. They may also act to build the conditions of security regionally and internationally by reducing transnational causes of insecurity, such as climate change, economic inequality, political exclusion, and nuclear proliferation.
