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Closed-circuit television (CCTV), then 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, even if it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. though approaching 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. though videotelephony is seldom called "CCTV" one exception is the use of video in isolate 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 statute enforcement, subsequently cameras located on a police officer's chest or head. Video surveillance has generated significant debate approximately balancing its use later individuals' right to privacy even following in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room, for example taking into consideration the feel is not satisfactory for humans. CCTV systems may do something forever or and no-one else 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, as soon as a variety of character and acquit yourself options and extra features (such as occupation detection and email alerts). More recently, decentralized IP cameras, perhaps equipped behind megapixel sensors, withhold recording directly to network-attached storage devices, or internal flash for categorically stand-alone operation.

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

The Dos and Don'ts of Installing Home Surveillance Cameras