Alerts generated by SIEM (Security Information and Event Management) tools are detective controls, as they identify and notify about suspicious activities but do not prevent or correct the events themselves.
Preventive controls stop incidents before they occur, corrective controls remediate issues, and compensating controls are alternatives used when primary controls aren't feasible.
Detective controls are foundational in Security Operations for incident detection and response#6:Chapter
14 CompTIA Security+ Study Guide#.