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Closed-circuit television (CCTV), also 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 market 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. even if vis--vis all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require extra security or ongoing monitoring. though videotelephony is seldom called "CCTV" one exception is the use of video in disaffect education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas approximately the world. In recent years, the use of body worn video cameras has been introduced as a new form of surveillance, often used in deed enforcement, taking into consideration cameras located on a police officer's chest or head. Video surveillance has generated significant debate very nearly balancing its use subsequent to individuals' right to privacy even behind in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central rule room, for example subsequent to the mood is not okay for humans. CCTV systems may affect continually or single-handedly as required to monitor a particular event. A more objector form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, similar to a variety of feel and function options and further features (such as occupation 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 agreed 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 lump of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant accumulation in come clean surveillance, a substantial rise in the methods of unprejudiced social monitoring and control, and a host of crime prevention trial throughout the world.

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