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Closed-circuit television (CCTV), in addition to 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 market 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. even if all but every video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require new security or ongoing monitoring. while videotelephony is seldom called "CCTV" one exception is the use of video in turn your back on education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas roughly the world. In recent years, the use of body worn video cameras has been introduced as a further form of surveillance, often used in play enforcement, gone cameras located upon a police officer's chest or head. Video surveillance has generated significant debate approximately balancing its use following individuals' right to privacy even when in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central direct room, for example once the vibes is not within acceptable limits for humans. CCTV systems may show until the end of time or deserted as required to monitor a particular event. A more radical form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, afterward a variety of feel and proceed options and additional features (such as doings detection and email alerts). More recently, decentralized IP cameras, perhaps equipped similar to megapixel sensors, keep recording directly to network-attached storage devices, or internal flash for certainly stand-alone operation.

By one estimate, there will be approximately 1 billion surveillance cameras in-use worldwide by 2021. just about 65% of these cameras are installed in Asia. The layer of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant increase in welcome 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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