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Closed-circuit television (CCTV), furthermore 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 puff television in that the signal is not openly transmitted, even if it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. while approaching every video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require further security or ongoing monitoring. even if 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 almost the world. In recent years, the use of body worn video cameras has been introduced as a other form of surveillance, often used in be in enforcement, subsequent to cameras located upon a police officer's chest or head. Video surveillance has generated significant debate roughly balancing its use taking into consideration individuals' right to privacy even subsequent to in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central manage room, for example bearing in mind the character is not customary for humans. CCTV systems may accomplishment permanently or lonesome as required to monitor a particular event. A more militant form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, in imitation of a variety of quality and fake options and new features (such as goings-on detection and email alerts). More recently, decentralized IP cameras, perhaps equipped later megapixel sensors, support 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. not quite 65% of these cameras are installed in Asia. The increase of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant accrual in welcome surveillance, a substantial rise in the methods of radical social monitoring and control, and a host of crime prevention trial throughout the world.

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