What role do motion detectors play in security systems?

Motion detectors are essential components of security systems designed specifically to detect movement within a defined area. They utilize various technologies, such as passive infrared (PIR), microwave, or dual-technology methods, to identify motion caused by individuals or objects. When motion is detected, the system can trigger alarms, send notifications to monitoring services, or activate surveillance cameras, serving as a proactive measure against unauthorized entry or potential threats.

Understanding that motion detectors focus solely on detecting movement clarifies their purpose within the broader security framework, which differentiates them from devices dedicated to other functions, such as monitoring environmental conditions or controlling lighting systems.