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Closed-circuit television (CCTV), after that 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. even though more or less 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 if videotelephony is seldom called "CCTV" one exception is the use of video in set against 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 further form of surveillance, often used in be in enforcement, subsequently cameras located upon a police officer's chest or head. Video surveillance has generated significant debate roughly balancing its use later individuals' right to privacy even once in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central direct room, for example taking into consideration the tone is not customary for humans. CCTV systems may appear in constantly or forlorn as required to monitor a particular event. A more broadminded form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, later a variety of mood and feign options and further features (such as bustle detection and email alerts). More recently, decentralized IP cameras, perhaps equipped next megapixel sensors, support recording directly to network-attached storage devices, or internal flash for extremely stand-alone operation.

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

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