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Closed-circuit television (CCTV), moreover 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 make public 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. even though concerning 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 separate from education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas roughly the world. In recent years, the use of body worn video cameras has been introduced as a supplementary form of surveillance, often used in behave enforcement, as soon as cameras located upon a police officer's chest or head. Video surveillance has generated significant debate roughly balancing its use taking into consideration 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 govern room, for example taking into consideration the mood is not enjoyable for humans. CCTV systems may operate for all time or lonely as required to monitor a particular event. A more broadminded form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, next a variety of air and comport yourself options and additional features (such as goings-on detection and email alerts). More recently, decentralized IP cameras, perhaps equipped considering megapixel sensors, retain recording directly to network-attached storage devices, or internal flash for totally stand-alone operation.

By one estimate, there will be approximately 1 billion surveillance cameras in-use worldwide by 2021. just about 65% of these cameras are installed in Asia. The accumulation of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant enlargement in disclose surveillance, a substantial rise in the methods of avant-garde social monitoring and control, and a host of crime prevention procedures throughout the world.

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