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Closed-circuit television (CCTV), as well as 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, even though it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. though nearly all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require additional security or ongoing monitoring. even though videotelephony is seldom called "CCTV" one exception is the use of video in push away education, where it is an important tool.

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

In industrial plants, CCTV equipment may be used to observe parts of a process from a central run room, for example similar to the feel is not suitable for humans. CCTV systems may conduct yourself continuously or deserted as required to monitor a particular event. A more open-minded form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, afterward a variety of tone and feat options and new features (such as pursuit detection and email alerts). More recently, decentralized IP cameras, perhaps equipped once megapixel sensors, preserve recording directly to network-attached storage devices, or internal flash for enormously stand-alone operation.

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

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