threat hunting (noun) [Word Notes]

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The process of proactively searching through networks to detect and isolate security threats, rather than relying on security solutions or services to detect those threats. 
CyberWire Glossary link: https://thecyberwire.com/glossary/threat-hunting
Audio reference link: “My ‘Aha!" Moment - Methods, Tips, & Lessons Learned in Threat Hunting - sans Thir Summit 2019.” YouTube, YouTube, 25 Feb. 2020.