Closed-circuit television (CCTV), also 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 broadcast television in that the signal is not openly
transmitted, though it may employ point to point (P2P), point to multipoint (P2MP), or mesh wired or wireless links.
Though almost all video cameras fit this definition, the term is most often applied to those used for surveillance in
areas that may need monitoring such as banks, stores, and other areas where security is needed. Though Video
telephony is seldom called 'CCTV' one exception is the use of video in distance education, where it is an important
tool.
CCTV equipment may be used to observe parts of a process from a central control room, for example when the
environment is not suitable for humans. CCTV systems may operate continuously or only as required to monitor a
particular event. A more advanced form of CCTV, utilizing digital video recorder (DVRs), provides recording for
possibly many years, with a variety of quality and performance options and extra features (such as motion detection
as and email alerts).
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