The Secretary of Defense is a high-ranking official in the United States government responsible for overseeing the Department of Defense (DoD). This position involves managing the nation's military forces, formulating defense policies, and ensuring national security. The Secretary is a key advisor to the President on military matters and plays a crucial role in shaping defense strategies. Appointed by the President and confirmed by the Senate, the Secretary of Defense leads the military branches, including the Army, Navy, and Air Force. This role requires collaboration with other government officials, military leaders, and international partners to address security challenges and protect the nation's interests.