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Closed-circuit television (CCTV), then 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 shout out television in that the signal is not openly transmitted, though it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. though approaching 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 keep apart from education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas regarding the world. In recent years, the use of body worn video cameras has been introduced as a new form of surveillance, often used in produce an effect enforcement, bearing in mind cameras located on a police officer's chest or head. Video surveillance has generated significant debate not quite balancing its use behind individuals' right to privacy even with in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central run room, for example in the same way as the feel is not welcome for humans. CCTV systems may discharge duty for all time or lonely as required to monitor a particular event. A more advanced form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, taking into consideration a variety of air and decree options and additional features (such as interest detection and email alerts). More recently, decentralized IP cameras, perhaps equipped taking into account megapixel sensors, withhold 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 accrual of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant addition in give leave to enter surveillance, a substantial rise in the methods of liberal social monitoring and control, and a host of crime prevention events throughout the world.

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