As the display terminal of the closed-circuit monitoring system, the monitor is an indispensable part of the monitoring system in addition to the camera. For a long time, monitors have been mainly used in power, energy, public security/transportation, finance, jewelry stores, hospitals, subways, stations, airports, exhibition halls, commercial office buildings, leisure and entertainment places, etc., and are responsible for security work. Due to the development of technology, the cost of the whole CCTV system has been well adjusted. More and more small enterprises are also able to bear the price, and begin to establish their own monitoring systems to meet security or other monitoring needs.

Generally, the monitor refers to the display. Some graphics cards can output dual displays, and the other is called the monitor. The development of monitors has experienced the development process from black and white to color, from flashing to non-flashing, from CRT to LCD and then to BSV liquid crystal technology.