The principle of CCTV is to record audio and video from the area where it happens and save it on a server or recording device. The operators or users who have access to the CCTV system can then watch and listen to the video and audio, and then check it. In many different industries, including security, environmental monitoring, and criminal investigation, CCTV is used effectively. CCTV in the security industry can be used to catch criminals in the act, stop crimes from happening, and capture evidence that can be used in future investigations. CCTV use, however, can also give rise to worries about data security and privacy.Â