National security refers to the protection of a nation's citizens, economy, and institutions from external threats. It encompasses a wide range of activities, including military defense, intelligence gathering, and diplomatic efforts to maintain peace and stability. The goal is to ensure the safety and well-being of the nation and its people. In today's interconnected world, national security also involves addressing non-traditional threats such as cyber attacks and terrorism. Agencies like the Department of Homeland Security work to safeguard against these risks, employing strategies that include surveillance, emergency response, and public awareness campaigns to enhance resilience against potential dangers.