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Closed-circuit television (CCTV), afterward known as video surveillance, is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from make public television in that the signal is not openly transmitted, even though it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even though approaching all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require further security or ongoing monitoring. even if videotelephony is seldom called "CCTV" one exception is the use of video in make unfriendly education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas in the region of the world. In recent years, the use of body worn video cameras has been introduced as a supplementary form of surveillance, often used in function enforcement, once cameras located on a police officer's chest or head. Video surveillance has generated significant debate about balancing its use taking into consideration individuals' right to privacy even next in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central govern room, for example when the tone is not within acceptable limits for humans. CCTV systems may act out each time or unaided as required to monitor a particular event. A more forward looking form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, as soon as a variety of character and piece of legislation options and extra features (such as pursuit detection and email alerts). More recently, decentralized IP cameras, perhaps equipped like megapixel sensors, keep recording directly to network-attached storage devices, or internal flash for extremely stand-alone operation.

By one estimate, there will be nearly 1 billion surveillance cameras in-use worldwide by 2021. about 65% of these cameras are installed in Asia. The deposit of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant growth in allow in surveillance, a substantial rise in the methods of highly developed social monitoring and control, and a host of crime prevention proceedings throughout the world.

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