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National security

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National security, often called national defence, is the protection of a sovereign state. This includes its citizens, its economy, and its government institutions. It is considered a fundamental duty of a government to ensure this safety. Originally, the concept focused mostly on protecting a nation from military attacks. However, the modern understanding has grown much wider. It now includes many non-military dimensions that keep a society functioning.

Today, national security covers several different areas of life. These include economic security, energy security, and food security. It also involves environmental security and cyber-security. Risks to a nation do not only come from other states. They can also come from violent non-state actors, such as terrorists. Organized crime and narcotic cartels are also considered threats. Even natural disasters, like floods or earthquakes, can impact a nation's security.

To manage these many risks, governments use various tools. They rely on political, economic, and military power. They also use diplomacy, which means negotiating with other nations. Some countries organize these efforts into a National Security Strategy (NSS). As of 2017, nations like Spain, Sweden, the United Kingdom, and the United States used these strategies. Some countries also use a National Security Council or a National Security Advisor. These agencies provide expert advice to the head of state. India established its own system on November 19, 1998.

Physical security is often the most visible part of national security. This involves the capacity to use military forces to protect borders. It helps a nation defend against military aggression or terrorism. Different countries use their militaries in different ways. For example, South Africa and Sweden focus on territorial defence. Other nations, like France, Russia, the UK, and the US, use expeditionary capabilities. These allow their armed forces to operate far from their own borders.

Another vital area is infrastructure security. This means protecting the systems that a country needs to function. Examples include airports, hospitals, bridges, and electricity grids. It also includes water systems, power plants, and oil refineries. Protecting these structures prevents damage from sabotage or terrorism. It also protects them from natural disasters like Hurricane Katrina. In the United States, the Federal Protective Service helps manage these risks. Other places use specialized units, like the British Transport Police.

In our digital age, cybersecurity has become a major priority. This is the protection of computers, smartphones, and networks. It involves securing hardware, software, and the data stored on them. Because societies rely so much on the Internet, cyberspace is now a domain of warfare. Unauthorized access to military or civil infrastructure is a serious threat. One example is the use of Stuxnet against the Iranian nuclear programme. Cyberattacks were also seen during the 2008 South Ossetia war.

Economic and environmental factors also drive national security. Economic security is the ability of a state to maintain its economy. A strong economy allows a nation to fund its defence and stability. This is why large economies like the US, China, and India have strong security setups. Environmental security, or ecological security, focuses on the health of ecosystems. Problems like climate change, deforestation, and biodiversity loss can cause instability. These issues can lead to food shortages or mass migration, which affects a nation's safety.

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