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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, on a limited set of monitors. It differs from present television in that the signal is not openly transmitted, even though it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. while re all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require supplementary security or ongoing monitoring. while 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 new form of surveillance, often used in take steps enforcement, once cameras located on a police officer's chest or head. Video surveillance has generated significant debate approximately 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 control room, for example afterward the mood is not okay for humans. CCTV systems may perform all the time or only as required to monitor a particular event. A more unbiased form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, afterward a variety of mood and produce an effect options and extra features (such as hobby detection and email alerts). More recently, decentralized IP cameras, perhaps equipped afterward megapixel sensors, maintain recording directly to network-attached storage devices, or internal flash for unconditionally stand-alone operation.

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

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