The National Investigation Agency (NIA) is a central agency established by the Government of India in 2009 to combat terrorism and other highly sensitive crimes that impact national security. The key functions and responsibilities of NIA are:

• Investigation and prosecution of offences related to terrorism and other national security issues across India.
• Investigation and prosecution of offences under Acts such as Explosive Substances Act, Unlawful Activities Prevention Act and Prevention of Damage to Public Property Act.
• Collection, analysis, and dissemination of information related to terrorism and other national security issues.
• Coordinating with state police forces and other agencies to prevent terrorism and maintain national security.
• Conducting research and analysis to identify new and emerging trends in terrorism.
• Participating in international forums to exchange information and intelligence to tackle terrorism and ensure national security.
• Protecting the rights of victims and witnesses, and ensuring their safety during the entire process of investigation and prosecution.
• Conducting training programs for police and other personnel to raise awareness and improve skills related to counter-terrorism and national security.

Overall, the NIA plays an important role in protecting the nation from terrorist threats and ensuring national security.