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An advanced persistent threat (APT) is a stealthy cybersecurity threat typically orchestrated by a state or state-sponsored group.

Notes on verification

Definition matches Wikipedia and is corroborated by CISA/NIST, Palo Alto Networks, Splunk, and an academic survey, all converging on stealth and state/state-sponsored origin as typical characteristics. [tier=gold indep_score=0.925 clusters=4 claim_tier=everyday]

Sources

An advanced persistent threat (APT) is a stealthy cyberse… · DeepInquiry