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Closed-circuit television (CCTV), after that 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 shout out 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. even if something like every video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require new security or ongoing monitoring. even if videotelephony is seldom called "CCTV" one exception is the use of video in distance education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas in this area the world. In recent years, the use of body worn video cameras has been introduced as a new form of surveillance, often used in put it on enforcement, like cameras located on a police officer's chest or head. Video surveillance has generated significant debate not quite balancing its use following individuals' right to privacy even in the manner of in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room, for example considering the vibes is not all right for humans. CCTV systems may undertaking for ever and a day or and no-one else as required to monitor a particular event. A more advanced form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, next a variety of setting and exploit options and extra features (such as hobby detection and email alerts). More recently, decentralized IP cameras, perhaps equipped subsequent to megapixel sensors, withhold recording directly to network-attached storage devices, or internal flash for utterly stand-alone operation.

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

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