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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, upon a limited set of monitors. It differs from present 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. even if approaching 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 isolate 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 sham enforcement, when cameras located on a police officer's chest or head. Video surveillance has generated significant debate very nearly balancing its use in imitation of individuals' right to privacy even as soon as in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central manage room, for example taking into account the environment is not agreeable for humans. CCTV systems may perform constantly or lonely as required to monitor a particular event. A more futuristic form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, subsequent to a variety of setting and bill options and further features (such as motion detection and email alerts). More recently, decentralized IP cameras, perhaps equipped past megapixel sensors, sustain recording directly to network-attached storage devices, or internal flash for definitely 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 addition of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant accrual in declare surveillance, a substantial rise in the methods of broadminded social monitoring and control, and a host of crime prevention dealings throughout the world.

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