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Closed-circuit television (CCTV), along with 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 publicize television in that the signal is not openly transmitted, even though it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even if on the order of every 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. though 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 just about the world. In recent years, the use of body worn video cameras has been introduced as a other form of surveillance, often used in be in enforcement, subsequent to cameras located upon a police officer's chest or head. Video surveillance has generated significant debate just about balancing its use in the manner of individuals' right to privacy even behind in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central run room, for example afterward the setting is not okay for humans. CCTV systems may sham continuously or single-handedly as required to monitor a particular event. A more innovative form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, subsequent to a variety of quality and play a role options and extra features (such as motion detection and email alerts). More recently, decentralized IP cameras, perhaps equipped in imitation of megapixel sensors, keep recording directly to network-attached storage devices, or internal flash for enormously 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 growth of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant deposit in declare surveillance, a substantial rise in the methods of forward looking social monitoring and control, and a host of crime prevention dealings throughout the world.

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