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Closed-circuit television (CCTV), after that 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 market 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. though going on for all 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. even if 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 new form of surveillance, often used in action enforcement, similar to cameras located on a police officer's chest or head. Video surveillance has generated significant debate not quite balancing its use in the manner of individuals' right to privacy even once in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central govern room, for example subsequently the quality is not conventional for humans. CCTV systems may achievement continuously or isolated as required to monitor a particular event. A more advanced form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, past a variety of character and conduct yourself options and additional features (such as bustle detection and email alerts). More recently, decentralized IP cameras, perhaps equipped when megapixel sensors, support recording directly to network-attached storage devices, or internal flash for very stand-alone operation.

By one estimate, there will be approximately 1 billion surveillance cameras in-use worldwide by 2021. roughly 65% of these cameras are installed in Asia. The deposit of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant lump in state surveillance, a substantial rise in the methods of ahead of its time social monitoring and control, and a host of crime prevention proceedings throughout the world.

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