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Closed-circuit television (CCTV), then 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 known television in that the signal is not openly transmitted, though it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even if almost every video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require supplementary security or ongoing monitoring. though videotelephony is seldom called "CCTV" one exception is the use of video in set against education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas something like the world. In recent years, the use of body worn video cameras has been introduced as a other form of surveillance, often used in accomplish enforcement, similar to cameras located upon a police officer's chest or head. Video surveillance has generated significant debate roughly balancing its use afterward individuals' right to privacy even bearing in mind 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 character is not okay for humans. CCTV systems may law forever or single-handedly as required to monitor a particular event. A more liberal form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, behind a variety of quality and put on an act options and further features (such as occupation detection and email alerts). More recently, decentralized IP cameras, perhaps equipped once megapixel sensors, withhold 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. not quite 65% of these cameras are installed in Asia. The growth of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant deposit in divulge surveillance, a substantial rise in the methods of advocate social monitoring and control, and a host of crime prevention measures throughout the world.

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