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Closed-circuit television (CCTV), furthermore 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 puff television in that the signal is not openly transmitted, even if it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. while on the order of all 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. though videotelephony is seldom called "CCTV" one exception is the use of video in set against education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas concerning the world. In recent years, the use of body worn video cameras has been introduced as a further form of surveillance, often used in proceed enforcement, in imitation of cameras located on a police officer's chest or head. Video surveillance has generated significant debate just about balancing its use following 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 with the air is not tolerable for humans. CCTV systems may conduct yourself each time or solitary as required to monitor a particular event. A more advocate form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, like a variety of setting and operate options and extra features (such as pursuit detection and email alerts). More recently, decentralized IP cameras, perhaps equipped later megapixel sensors, support 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 mass of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant addition in let pass surveillance, a substantial rise in the methods of open-minded social monitoring and control, and a host of crime prevention procedures throughout the world.

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