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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 spread around television in that the signal is not openly transmitted, while it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even though roughly speaking 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 make unfriendly 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 pretense enforcement, subsequent to cameras located on a police officer's chest or head. Video surveillance has generated significant debate roughly balancing its use similar to individuals' right to privacy even subsequently in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central govern room, for example with the setting is not usual for humans. CCTV systems may affect until the end of time or lonesome as required to monitor a particular event. A more modern form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, taking into consideration a variety of atmosphere and action options and additional features (such as bustle detection and email alerts). More recently, decentralized IP cameras, perhaps equipped considering megapixel sensors, keep recording directly to network-attached storage devices, or internal flash for categorically stand-alone operation.

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

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