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Closed-circuit television (CCTV), with 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 push 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. though almost all 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 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 approximately the world. In recent years, the use of body worn video cameras has been introduced as a further form of surveillance, often used in play-act enforcement, taking into account cameras located on a police officer's chest or head. Video surveillance has generated significant debate not quite balancing its use when 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 like the quality is not up to standard for humans. CCTV systems may function each time or solitary as required to monitor a particular event. A more open-minded form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, past a variety of environment and accomplish options and further features (such as commotion detection and email alerts). More recently, decentralized IP cameras, perhaps equipped next megapixel sensors, sustain recording directly to network-attached storage devices, or internal flash for totally stand-alone operation.

By one estimate, there will be nearly 1 billion surveillance cameras in-use worldwide by 2021. very nearly 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 buildup in declare surveillance, a substantial rise in the methods of unprejudiced social monitoring and control, and a host of crime prevention dealings throughout the world.

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