Specificity is the degree to which a biological agent acts on one intended target rather than many. A highly specific enzyme, toxin, or receptor binder interacts with a narrow molecule, cell type, or pathway. Low specificity means broader activity, which can create off-target effects and make the outcome less predictable.
In cyber security and biosecurity, specificity matters because precision changes both risk and control. Attackers may favor highly specific tools when they want to affect only a particular target while avoiding broad detection or collateral damage. Defenders also rely on specificity in signatures, rules, and sensors: a specific detection can reduce false positives, but if it is too narrow it may miss related threats. The practical goal is to balance precision with coverage.