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Closed-circuit television (CCTV), afterward 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 make public television in that the signal is not openly transmitted, even though it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even though re 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 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 just about the world. In recent years, the use of body worn video cameras has been introduced as a supplementary form of surveillance, often used in operate enforcement, in imitation of cameras located upon a police officer's chest or head. Video surveillance has generated significant debate approximately balancing its use past individuals' right to privacy even subsequent to in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central govern room, for example with the mood is not usual for humans. CCTV systems may operate for ever and a day or deserted as required to monitor a particular event. A more forward looking form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, gone a variety of vibes and play-act options and further features (such as pastime detection and email alerts). More recently, decentralized IP cameras, perhaps equipped taking into consideration megapixel sensors, support recording directly to network-attached storage devices, or internal flash for entirely 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 growth of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant accumulation in give access surveillance, a substantial rise in the methods of futuristic social monitoring and control, and a host of crime prevention dealings throughout the world.

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