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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, upon a limited set of monitors. It differs from spread around 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. even if not far off from every video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require additional security or ongoing monitoring. even if videotelephony is seldom called "CCTV" one exception is the use of video in separate from 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 other form of surveillance, often used in perform enforcement, behind cameras located upon a police officer's chest or head. Video surveillance has generated significant debate very nearly balancing its use taking into consideration 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 control room, for example later than the setting is not enjoyable for humans. CCTV systems may operate continuously or lonesome as required to monitor a particular event. A more ahead of its time form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, later a variety of tone and produce a result options and extra features (such as bustle detection and email alerts). More recently, decentralized IP cameras, perhaps equipped gone megapixel sensors, hold recording directly to network-attached storage devices, or internal flash for totally stand-alone operation.

By one estimate, there will be nearly 1 billion surveillance cameras in-use worldwide by 2021. about 65% of these cameras are installed in Asia. The accumulation of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant mass in acknowledge surveillance, a substantial rise in the methods of advocate social monitoring and control, and a host of crime prevention measures throughout the world.

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