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Zero Trust Architecture (ZTA), also Zero-Trust Architecture, is an enterprise’s cybersecurity plan that utilizes Zero Trust (ZT) concepts and encompasses component relationships, workflow planning, and access policies. Therefore, a zero-trust enterprise is the network infrastructure (physical and virtual) and operational policies that are in place for an enterprise as a product of a zero trust architecture plan.

Source: NIST: SP 800-207: Zero Trust Architecture (ZTA)