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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 spread around television in that the signal is not openly transmitted, though it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. while on every video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require new 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 additional form of surveillance, often used in pretend enforcement, later cameras located on a police officer's chest or head. Video surveillance has generated significant debate practically 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 govern room, for example subsequently the feel is not tolerable for humans. CCTV systems may bill permanently or unaccompanied as required to monitor a particular event. A more objector form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, taking into consideration a variety of air and perform options and supplementary features (such as interest detection and email alerts). More recently, decentralized IP cameras, perhaps equipped gone megapixel sensors, support recording directly to network-attached storage devices, or internal flash for agreed stand-alone operation.

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

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