CCTV (closedcircuit television) is a TV system in which signals are not publicly distributed but are monitored, primarily for surveillance and security purposes.
There are about 350 million surveillance cameras worldwide as of 2016. Surveillance of the public using CCTV is common in many areas around the world. CCTV is the surveillance solution of choice for high traffic areas like airports, banks, terminals and malls. These systems allow users to remotely patrol the insides and outsides of buildings, reducing the need for extra manpower and increasing the capabilities of existing personnel. And if you are wondering, CCTV technology can be used in your home as well!