Definition
Open-Source Intelligence (OSINT) is the process of collecting, analysing and using information from publicly available sources to support security analysis, Risk Assessment or decision-making.
Human Explanation
OSINT uses lawfully available information to build knowledge about people, organisations, infrastructure or threats.
Why it Matters
Both organisations and attackers use public information; understanding exposure reduces unintended disclosure risk.
Conceptual Boundary
OSINT uses lawfully available sources and does not include intrusion or unauthorised access.
Practical Perspective
It supports Threat Intelligence, security testing, Due Diligence, counterparty verification and exposure assessment.