Monitoring activity captured by the surveillance camera can help detecting malicious activities. The presence of a camera may deter some of the less determined attackers. Video surveillance on its own cannot prevent an intrusion.****EDIT*****The answer should be preventive, deterrent and detective...https://www.eduonix.com/blog/networking-and-security/learn-different-types-security-controls-cissp/ *****EDIT****Video Surveillance is all three. Surveillance cameras that are highly visible but aren't connected to anything are preventive and deterrent. You see it all the time in cop shows where a cop will see a gas station camera and the gas station owner will say the camera is just for show, it isn't connected to anything VK How does security camera provide preventative control? By discouraging potential attacker? Then it is deterrent. Video recording can also serve for detective purposes. But, video camera can not prevent someone from committing a crime. **** EDIT CCTV cannot act as a preventive control. It is a detective and deterrent (to discourage malicious actors) control.