This brochure provides an overview of the Federal Bureau of Investigation's [FBI] responsibilities in regards to cybersecurity. "The FBI has a unique dual responsibility, to prevent harm to national security as the nation's domestic intelligence agency and to enforce federal laws as the nation's principal law enforcement agency. These roles are complementary, as threats to the nation's cybersecurity can emanate from nation-states, terrorist organizations, and transnational criminal enterprises; with the lines between sometimes blurred. The FBI's unified mission brings all lawful investigative techniques and legal tools together in combating these threats. This approach facilitates information sharing and ensures responsible stewardship of resources by collocating talent, tools, and institutional knowledge in a single organization."