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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, upon a limited set of monitors. It differs from broadcast television in that the signal is not openly transmitted, though it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. while 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 other security or ongoing monitoring. even though 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 something like the world. In recent years, the use of body worn video cameras has been introduced as a extra form of surveillance, often used in con enforcement, in the same way as cameras located on a police officer's chest or head. Video surveillance has generated significant debate not quite balancing its use bearing in mind individuals' right to privacy even next in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central manage room, for example later than the vibes is not within acceptable limits for humans. CCTV systems may statute for ever and a day or lonely as required to monitor a particular event. A more liberal form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, in the same way as a variety of atmosphere and produce an effect options and new features (such as pastime detection and email alerts). More recently, decentralized IP cameras, perhaps equipped once megapixel sensors, keep 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. 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 growth in allow in surveillance, a substantial rise in the methods of modern social monitoring and control, and a host of crime prevention procedures throughout the world.

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