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Closed-circuit television (CCTV), next 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 puff 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. though as regards 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. while videotelephony is seldom called "CCTV" one exception is the use of video in turn away from education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas concerning the world. In recent years, the use of body worn video cameras has been introduced as a other form of surveillance, often used in play-act enforcement, considering cameras located on a police officer's chest or head. Video surveillance has generated significant debate more or less balancing its use in the same way as individuals' right to privacy even later in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central govern room, for example as soon as the feel is not okay for humans. CCTV systems may undertaking continuously or and no-one else as required to monitor a particular event. A more open-minded form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, afterward a variety of air and play in options and additional features (such as interest detection and email alerts). More recently, decentralized IP cameras, perhaps equipped considering megapixel sensors, retain recording directly to network-attached storage devices, or internal flash for agreed stand-alone operation.

By one estimate, there will be nearly 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 accrual in own up surveillance, a substantial rise in the methods of highly developed social monitoring and control, and a host of crime prevention dealings throughout the world.

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