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Closed-circuit television (CCTV), as a consequence known as video surveillance, is the use of video cameras to transmit a signal to a specific place, upon a limited set of monitors. It differs from promote television in that the signal is not openly transmitted, even though it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even if not far off from all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require other security or ongoing monitoring. even though 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 as regards the world. In recent years, the use of body worn video cameras has been introduced as a extra form of surveillance, often used in function enforcement, taking into consideration 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 taking into account in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central direct room, for example next the mood is not gratifying for humans. CCTV systems may doing forever or without help as required to monitor a particular event. A more advocate form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, subsequent to a variety of mood and feign options and additional features (such as pastime detection and email alerts). More recently, decentralized IP cameras, perhaps equipped considering megapixel sensors, withhold recording directly to network-attached storage devices, or internal flash for certainly 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 growth of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant growth in acknowledge surveillance, a substantial rise in the methods of broadminded social monitoring and control, and a host of crime prevention trial throughout the world.

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