ZTA is the NIST-defined framework for implementing zero trust. NIST SP 800-207 defines seven pillars: Identity, Devices, Networks, Applications, Data, Visibility/Analytics, Automation.
ZTA is the architecture; zero trust is the principle. NIST SP 800-207 is the authoritative reference. Key requirements: verify explicitly, use least privilege, assume breach, end-to-end encryption, continuous monitoring.