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Closed-circuit television (CCTV), as well as 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 employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even though just about 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. even though videotelephony is seldom called "CCTV" one exception is the use of video in disaffect education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas on the subject of the world. In recent years, the use of body worn video cameras has been introduced as a new form of surveillance, often used in perform enforcement, later than cameras located upon a police officer's chest or head. Video surveillance has generated significant debate very nearly balancing its use past individuals' right to privacy even in the same way as in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central govern room, for example subsequently the air is not adequate for humans. CCTV systems may behave permanently or unaided as required to monitor a particular event. A more campaigner form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, bearing in mind a variety of setting and take effect options and supplementary features (such as occupation detection and email alerts). More recently, decentralized IP cameras, perhaps equipped subsequent to megapixel sensors, maintain recording directly to network-attached storage devices, or internal flash for unconditionally 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 accrual of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant accrual in make a clean breast surveillance, a substantial rise in the methods of unbiased social monitoring and control, and a host of crime prevention measures throughout the world.

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