Closed-circuit television (CCTV) is the usage of cameras, particularly for video recording to send signals to a location and display them on a monitor. CCTV is used in those areas where a secure eye is required. With the use of CCTV, you can have a look at the live feeds or playback the recorded incident for use. In June 1927, a Russian physicist invented the first mechanical CCTV system. In 1942, Peenemünde, Nazi Germany, developed another pioneer CCTV system for monitoring the launching of V-2 rockets. The very first commercialized closed-circuit television system, termed Vericon, had become available in the United States in 1949.