CCTV (Closed Circuit Television) system is a type of video surveillance system that uses cameras to monitor a specific area or location. It typically consists of cameras, a recording device (such as a DVR or NVR), and a display monitor.

The cameras are strategically placed to capture footage of the area under surveillance, which is then transmitted to the recording device. The recording device stores the video footage for a set period of time, allowing it to be reviewed later if necessary. The display monitor is used to view live footage and playback recorded footage.

CCTV systems can be used for a variety of purposes, such as security surveillance in public places, monitoring of workplaces and industrial areas, and traffic monitoring. They are also commonly used in homes and residential areas for security purposes. CCTV systems can be either analog or digital, with digital systems typically offering higher resolution and more advanced features such as remote viewing and motion detection.