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Closed-circuit television (CCTV), furthermore 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 push 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. even though more or less 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 just about the world. In recent years, the use of body worn video cameras has been introduced as a supplementary form of surveillance, often used in proceed enforcement, following cameras located upon a police officer's chest or head. Video surveillance has generated significant debate about balancing its use similar to individuals' right to privacy even past in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central run room, for example subsequent to the character is not usual for humans. CCTV systems may produce a result at all times or forlorn as required to monitor a particular event. A more unprejudiced form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, subsequent to a variety of setting and operate options and other features (such as commotion detection and email alerts). More recently, decentralized IP cameras, perhaps equipped later than megapixel sensors, preserve recording directly to network-attached storage devices, or internal flash for unquestionably stand-alone operation.

By one estimate, there will be approximately 1 billion surveillance cameras in-use worldwide by 2021. more or less 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 layer in give leave to enter 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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