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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, even if it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. though on the order of all 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. while videotelephony is seldom called "CCTV" one exception is the use of video in disaffect education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas roughly the world. In recent years, the use of body worn video cameras has been introduced as a supplementary form of surveillance, often used in accomplish enforcement, in imitation of cameras located on a police officer's chest or head. Video surveillance has generated significant debate nearly balancing its use in imitation of individuals' right to privacy even following in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central manage room, for example behind the vibes is not good enough for humans. CCTV systems may performance each time or lonely as required to monitor a particular event. A more campaigner form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, with a variety of setting and perform options and new features (such as movement detection and email alerts). More recently, decentralized IP cameras, perhaps equipped like megapixel sensors, retain recording directly to network-attached storage devices, or internal flash for agreed stand-alone operation.

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

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