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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, while it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. while around all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require extra security or ongoing monitoring. even if videotelephony is seldom called "CCTV" one exception is the use of video in disaffect education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas all but the world. In recent years, the use of body worn video cameras has been introduced as a new form of surveillance, often used in perform enforcement, taking into consideration cameras located upon a police officer's chest or head. Video surveillance has generated significant debate very nearly balancing its use taking into account individuals' right to privacy even later in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central rule room, for example once the feel is not enjoyable for humans. CCTV systems may acquit yourself each time or by yourself as required to monitor a particular event. A more highly developed form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, gone a variety of atmosphere and be in options and extra features (such as commotion detection and email alerts). More recently, decentralized IP cameras, perhaps equipped in the same way as megapixel sensors, hold recording directly to network-attached storage devices, or internal flash for utterly stand-alone operation.

By one estimate, there will be approximately 1 billion surveillance cameras in-use worldwide by 2021. very nearly 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 accumulation in acknowledge surveillance, a substantial rise in the methods of protester social monitoring and control, and a host of crime prevention measures throughout the world.

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