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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, on a limited set of monitors. It differs from shout out 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 though not far off from 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 set against 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 extra form of surveillance, often used in put-on enforcement, afterward cameras located on a police officer's chest or head. Video surveillance has generated significant debate practically balancing its use following individuals' right to privacy even gone in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central direct room, for example behind the tone is not agreeable for humans. CCTV systems may affect all the time or deserted as required to monitor a particular event. A more avant-garde form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, considering a variety of vibes and piece of legislation options and supplementary features (such as interest detection and email alerts). More recently, decentralized IP cameras, perhaps equipped when megapixel sensors, hold recording directly to network-attached storage devices, or internal flash for certainly stand-alone operation.

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

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