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High Quality Content by WIKIPEDIA articles! Physical security describes both measures that prevent or deter attackers from accessing a facility, resource, or information stored on physical media and guidance on how to design structures to resist various hostile acts. It can be as simple as a locked door or as elaborate as multiple layers of armed Security guards and Guardhouse placement. Physical security is not a modern phenomenon. Physical security exists in order to deter persons from entering a physical facility. Historical examples of physical security include city walls, moats, etc. The key factor is the technology used for physical security has changed over time. While in past eras, there was no Passive Infrared (PIR) based technology, electronic access control systems, or Video Surveillance System (VSS) cameras, the essentially methodology of physical security has not altered over time. Physical Security: Attacker, Security Guard, Guardhouse, Security Engineering, Explosion Protection, Security Lighting