Closed-circuit television (CCTV) is
the use of video camera to transmit a signal to a specific place, on a
limited set of monitors.
differs from broadcast television in that the signal is not openly
transmitted, though it may employ point to point wireless links. CCTV is
often used for surveillance in areas that may need monitoring such as
banks, casinos, airports, military installations, and convenience
plants, CCTV equipment may be used to observe parts of a process from a
central control room; when, for example, 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 Recorders (DVRs), provides recording for possibly many
years, with a variety of quality and performance options and extra
features (such as motion-detection and email alerts).
of the public using CCTV is particularly common in the UK, where there
are reportedly more cameras per person than in any other country in the
world. There and elsewhere, its increasing use has triggered a debate about security versus privacy.