CCTV (closed-circuit television) is a TV system in which signals are not publicly distributed but are monitored, primarily for surveillance and security purposes. CCTV relies on strategic placement of cameras, and observation of the camera’s input on monitors somewhere.

CCTV systems may operate continuously or only as required to monitor a particular event. A more advanced form of CCTV, utilizing digital video recorders (DVRs), provides recording for possibly many years, with a variety of quality and performance options and extra features (such as motion detection and email alerts). More recently, decentralized IP cameras, some equipped with megapixel sensors, support recording directly to network-attached storage devices, or internal flash for completely stand-alone operation.

CCTV systems provide a view of access and movements in an area or processes on a site. A system can be accessed and managed from one or more control stations, on site or remote. CCTV surveillance is vital for the coordination of appropriate response in critical situations. Proactive and reactive surveillance tasks increase safety, security, efficiency for people, facilities and the environment.

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