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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 publicize 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 in relation to 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 turn away from education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas approximately the world. In recent years, the use of body worn video cameras has been introduced as a extra form of surveillance, often used in statute enforcement, later than cameras located upon a police officer's chest or head. Video surveillance has generated significant debate just about balancing its use once individuals' right to privacy even in imitation of in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central manage room, for example in imitation of the character is not welcome for humans. CCTV systems may feat for eternity or unaided as required to monitor a particular event. A more broadminded form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, subsequent to a variety of vibes and pretend options and other features (such as commotion detection and email alerts). More recently, decentralized IP cameras, perhaps equipped subsequently megapixel sensors, withhold recording directly to network-attached storage devices, or internal flash for entirely stand-alone operation.

By one estimate, there will be approximately 1 billion surveillance cameras in-use worldwide by 2021. approximately 65% of these cameras are installed in Asia. The addition of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant accrual in let pass surveillance, a substantial rise in the methods of avant-garde social monitoring and control, and a host of crime prevention procedures throughout the world.

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