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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 spread around television in that the signal is not openly transmitted, while it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. while a propos 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. while 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 on the world. In recent years, the use of body worn video cameras has been introduced as a supplementary form of surveillance, often used in comport yourself enforcement, in the same way as cameras located on a police officer's chest or head. Video surveillance has generated significant debate approximately balancing its use when 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 manage room, for example afterward the air is not usual for humans. CCTV systems may show all the time or solitary as required to monitor a particular event. A more liberal form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, afterward a variety of tone and function options and additional features (such as hobby detection and email alerts). More recently, decentralized IP cameras, perhaps equipped with megapixel sensors, maintain recording directly to network-attached storage devices, or internal flash for categorically stand-alone operation.

By one estimate, there will be approximately 1 billion surveillance cameras in-use worldwide by 2021. 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 increase in come clean surveillance, a substantial rise in the methods of ahead of its time social monitoring and control, and a host of crime prevention procedures throughout the world.

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