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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, upon a limited set of monitors. It differs from puff television in that the signal is not openly transmitted, even though it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. while in relation to all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require extra security or ongoing monitoring. even though 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 speaking the world. In recent years, the use of body worn video cameras has been introduced as a other form of surveillance, often used in show enforcement, later than cameras located upon a police officer's chest or head. Video surveillance has generated significant debate nearly balancing its use in the manner of 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 taking into consideration the vibes is not within acceptable limits for humans. CCTV systems may function each time or abandoned as required to monitor a particular event. A more unprejudiced form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, like a variety of quality and law options and additional features (such as hobby detection and email alerts). More recently, decentralized IP cameras, perhaps equipped like megapixel sensors, preserve recording directly to network-attached storage devices, or internal flash for totally 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 increase of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant addition in declare surveillance, a substantial rise in the methods of radical social monitoring and control, and a host of crime prevention dealings throughout the world.

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