Homeland Security is a term that refers to measures and procedures implemented by governments to safeguard their countries from terrorist attacks and other threats. Synonyms for Homeland Security include National Security, Internal Security, Domestic Security, and Protection of the Homeland. National Security refers to measures taken by a nation to protect its citizens from external threats that might harm the country's sovereignty. Internal Security relates to measures taken by the government to maintain peace and law and order within the country. Domestic Security pertains to security measures taken to protect citizens and infrastructure within the nation. Protection of the Homeland relates to procedures implemented to protect the country's borders from external threats.