Homeland Defense refers to the efforts and strategies implemented by a nation to protect its territory, citizens, and critical infrastructure from threats, both external and internal. This includes military readiness, emergency response planning, and coordination among various government agencies to ensure safety and security. In the United States, the Department of Homeland Security (DHS) plays a key role in these efforts, focusing on preventing terrorist attacks, managing natural disasters, and safeguarding borders. Homeland Defense also involves collaboration with local law enforcement and community organizations to enhance resilience and preparedness against potential threats.