National security is a broad field that encompasses the measures taken by a government to protect its citizens, institutions, and territory from external threats. This typically includes defense against military attacks, but also encompasses other threats such as terrorism, cyber attacks, and natural disasters. National security research focuses on understanding and mitigating these threats through a combination of military, diplomatic, economic, and technological strategies. Researchers in this field may study topics such as intelligence gathering, military strategy, cybersecurity, and counter-terrorism efforts. The ultimate goal of national security research is to ensure the safety and well-being of a country's population and infrastructure.