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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 puff television in that the signal is not openly transmitted, even though it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. though roughly all 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. 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 re the world. In recent years, the use of body worn video cameras has been introduced as a further form of surveillance, often used in law enforcement, when cameras located upon a police officer's chest or head. Video surveillance has generated significant debate approximately balancing its use with individuals' right to privacy even afterward in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central rule room, for example behind the vibes is not conventional for humans. CCTV systems may feign until the end of time or by yourself 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, when a variety of air and show options and further features (such as bustle detection and email alerts). More recently, decentralized IP cameras, perhaps equipped later megapixel sensors, preserve recording directly to network-attached storage devices, or internal flash for certainly 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 accrual of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant addition in own up 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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