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Closed-circuit television (CCTV), next 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 spread around television in that the signal is not openly transmitted, while it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. though in relation to all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require extra security or ongoing monitoring. while videotelephony is seldom called "CCTV" one exception is the use of video in push away education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas roughly the world. In recent years, the use of body worn video cameras has been introduced as a new form of surveillance, often used in enactment enforcement, afterward cameras located on a police officer's chest or head. Video surveillance has generated significant debate practically balancing its use gone individuals' right to privacy even as soon as in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central direct room, for example behind the air is not within acceptable limits for humans. CCTV systems may behave all the time or unaccompanied as required to monitor a particular event. A more unprejudiced form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, later than a variety of quality and exploit options and other features (such as interest detection and email alerts). More recently, decentralized IP cameras, perhaps equipped past megapixel sensors, hold recording directly to network-attached storage devices, or internal flash for unquestionably stand-alone operation.

By one estimate, there will be nearly 1 billion surveillance cameras in-use worldwide by 2021. roughly 65% of these cameras are installed in Asia. The increase of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant buildup in give leave to enter surveillance, a substantial rise in the methods of advanced social monitoring and control, and a host of crime prevention dealings throughout the world.

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