Surveillance tools are systems used to collect, process, and manage monitoring data. In cyber security, they can include software and infrastructure that capture network traffic, log user activity, correlate events, or present alerts to analysts. The same category can support legitimate defense and abusive spying, depending on who controls it and what oversight exists.
These tools matter because they often sit at the center of trust: if access is weakly controlled, monitoring data can be stolen, altered, or used to track people without authorization. In real attacks, threat actors may try to disable logs, evade sensors, or compromise monitoring platforms before moving deeper into a network. Defenders rely on them for detection, forensics, and incident response, so strong authentication, auditing, and review are essential.