Close-circuit television or CCTV is the technology which transmits videos from mounted cameras to remote monitors, commonly for security and safety reasons. The transmission can take place either through cables connecting the video camera to the monitors or through wireless connection.

Developed originally in Germany in 1942 to observe the V2-rocket launch by German engineer Walter Bruch, the CCTV system was installed in main business streets to prevent crimes. Banks and stores followed suit, to monitor the activities within the establishment and as a record of evidence of criminal activity. Today, CCTV systems are available for a private individual to install for the security of their homes and properties.