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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, upon a limited set of monitors. It differs from publicize television in that the signal is not openly transmitted, while it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even though with reference to 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 turn away from 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 extra form of surveillance, often used in perform enforcement, as soon as cameras located upon a police officer's chest or head. Video surveillance has generated significant debate about balancing its use with individuals' right to privacy even behind in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room, for example like the environment is not pleasing for humans. CCTV systems may decree until the end of time or unaided as required to monitor a particular event. A more advocate form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, as soon as a variety of feel and acquit yourself options and extra features (such as interest detection and email alerts). More recently, decentralized IP cameras, perhaps equipped subsequent to megapixel sensors, preserve recording directly to network-attached storage devices, or internal flash for enormously stand-alone operation.

By one estimate, there will be nearly 1 billion surveillance cameras in-use worldwide by 2021. just about 65% of these cameras are installed in Asia. The layer of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant accrual in allow in surveillance, a substantial rise in the methods of unprejudiced social monitoring and control, and a host of crime prevention proceedings throughout the world.

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