A National Security Advisor (NSA) is a senior official in a government responsible for advising the head of state on matters of national security and foreign policy. The NSA coordinates the efforts of various government agencies, ensuring that security strategies align with the country's interests. This role is crucial in shaping responses to international crises and threats. The NSA often leads the National Security Council, which includes key officials from different departments, such as the Department of Defense and the State Department. By facilitating communication among these agencies, the NSA helps create a cohesive approach to national security challenges.