The National Security Advisor (NSA) is a key official in India's national security architecture. The role of the NSA is to advise the Prime Minister on matters related to national security and help coordinate policy across different departments and agencies. Some of the significant functions performed by the NSA are:

• Assisting the Prime Minister in formulating and implementing national security policies and strategies.
• Coordinate between various ministries and agencies involved in national security matters.
• Provide input to the Prime Minister on foreign policy issues and engagement with other countries.
• Act as the primary interlocutor with the security establishments for the Prime Minister.
• Advise the Prime Minister on issues related to terrorism, internal security, and intelligence.
• Conduct risk assessments and provide early warning of potential security threats.
• Representing India in various global fora on security issues.

Overall, the National Security Advisor plays a crucial role in ensuring the security and safety of India, and his or her advice and counsel are critical for the effective functioning of the government.