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The use of video cameras to transmit a signal to a specific place on a limited set of distinctly digital monitors is the use of Closed-circuit television or better known as CTV. It is different from broadcast television in a sense that the signal is not openly transmitted.

CCTV is often used for surveillance that may need monitoring such as banks, hotels, airports, airports, military purposes, and convenience stores and even in buildings of Hertfordshire SEO and other companies and corporations. It is also an important tool for industrial plants for CCTV tool equipment can be used to observe parts of a process from a central control room when the environment is not suitable for humans. It is also used by industries to monitor the labor force inside..
Surveillance of the traffic using CCTV is particularly common in highways or places where numerous vehicles pass every day. On a subway train, CCTV cameras allow the operator to confirm that people are clear of doors before closing them and starting the train.