# National Security Agency **Domain:** Signals Intelligence / Cybersecurity / United States Government **Doc Type:** Agency Node **Maturity:** Canonical ## Definition The **National Security Agency**, or **NSA**, is a United States intelligence agency responsible for foreign signals intelligence and cybersecurity missions. ## Corpus Context [[journal/2026-08-21 - Cyber Terrorism Is Terrorism|Cyber Terrorism Is Terrorism]] contrasts the incident-response resources available to major institutions and national-security agencies with those available to an individual managing an enterprise-scale personal information estate. ## Sources / Provenance - [NSA — official site](https://www.nsa.gov/) ## See Also [[wiki/Office of the Director of National Intelligence|Office of the Director of National Intelligence]], [[wiki/Cybersecurity and Infrastructure Security Agency|CISA]], [[wiki/Advanced Persistent Threat|Advanced Persistent Threat]]