Threat visibility is the ability to observe, classify, and track hostile activity before it becomes a larger problem. It means security teams can see suspicious events, decide whether they matter, and follow them over time as they move from noise to confirmed incident. Visibility is not the same as prevention, but without it defenders often learn about attacks only after damage is done.
In practice, threat visibility comes from logs, endpoint telemetry, network monitoring, cloud alerts, and threat intelligence. Good visibility helps analysts spot scans, credential stuffing, malware callbacks, or unusual privilege changes early enough to contain them. It also supports incident triage by separating harmless anomalies from activity that needs immediate response. In defense programs, weak visibility creates blind spots; in attacks, adversaries often try to reduce visibility by deleting logs, hiding in normal traffic, or using legitimate tools to blend in.