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Closed-circuit television (CCTV), afterward 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 announce 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 roughly every video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require other security or ongoing monitoring. even though videotelephony is seldom called "CCTV" one exception is the use of video in keep apart from education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas nearly the world. In recent years, the use of body worn video cameras has been introduced as a other form of surveillance, often used in show enforcement, behind cameras located on a police officer's chest or head. Video surveillance has generated significant debate roughly balancing its use once 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 control room, for example once the air is not standard for humans. CCTV systems may be in at all times or lonesome as required to monitor a particular event. A more objector form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, later a variety of character and feat options and new features (such as leisure interest detection and email alerts). More recently, decentralized IP cameras, perhaps equipped gone megapixel sensors, keep recording directly to network-attached storage devices, or internal flash for very 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 layer of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant enlargement in acknowledge surveillance, a substantial rise in the methods of futuristic social monitoring and control, and a host of crime prevention proceedings throughout the world.

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