CCTV (Closed Circuit Television) is a closed system that consists of video cameras, display devices (monitors), and wired or wireless data networks that allow images from video cameras to be transferred to monitors. In addition to cameras and monitors, video surveillance systems frequently contain servers, disk storage, and client computers for storing and processing video data. Security and other information systems can also be combined with video surveillance systems.

CCTV technology can be used in industrial operations to monitor components of a process from a central control room. When the environment is unsuitable for people, for example. CCTV systems can run continuously or only when needed to monitor a specific event.