Dome camera in a rail station Closed-circuit television ( CCTV), also known as video surveillance, is the use of to transmit a signal to a specific place, on a limited set of monitors. It differs from in that the signal is not openly transmitted, though it may employ point to point (P2P), point to multipoint (P2MP), or wired or wireless links. Though almost all video cameras fit this definition, the term is most often applied to those used for in areas that may need monitoring such as banks, stores, and other areas where security is needed. Though is seldom called 'CCTV' one exception is the use of video in, where it is an important tool. Surveillance of the public using CCTV is common in many areas around the world. In recent years, the use of cameras has been introduced as a new form of surveillance, often used in law enforcement, with cameras located on a police officer's chest or head.

Video surveillance has generated significant debate about balancing its use with individuals' even when in public. In industrial plants, CCTV equipment may be used to observe parts of a process from a central, for example when the environment is not suitable for humans. CCTV systems may operate continuously or only as required to monitor a particular event.

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How to install your DVR (Digital Video Recorder) and Security Cameras (CCTV Cameras) How to install your DVR (Digital Video Recorder) and Security Cameras (CCTV Cameras). CCTV Installation. Security transitioned from “analog” closed-circuit TV (CCTV) for surveillance to “digital” CCTV for surveillance. After the transition, Security realized that a different skill set (IT server support) was needed in using servers with hard drives compared to using video cassette recorders (VCRs).

A more advanced form of CCTV, utilizing (DVRs), provides recording for possibly many years, with a variety of quality and performance options and extra features (such as and email alerts). More recently, decentralized, perhaps equipped with megapixel sensors, support recording directly to devices, or internal flash for completely stand-alone operation.

There are about 350 million surveillance cameras worldwide as of 2016. About 65% of these cameras are installed in Asia. The growth of CCTV has been slowing in recent years.

CCTV control-room monitor wall for 176 open-street cameras in 2017. The first CCTV system was installed by at in, Nazi Germany in 1942, for observing the launch of. The noted German engineer was responsible for the technological design and installation of the system. [ ] In the U.S. The first commercial closed-circuit television system became available in 1949, called Vericon.