CCTV, or Closed-circuit television, is the use of television cameras for surveillance. It differs from broadcast television in that all components are directly linked via cables or other direct means. CCTV is often used in areas where there is an increased need for security, such as banks, casinos, airports, fatories and research facilities. CCTVs are also used as a part of home security system.

The latest development in the world of CCTV is in the use of wireless or usb digital stills cameras that can take 1600 x 1200 pixel resolution images of the camera scene either on a time lapse or motion detection basis. Images of the camera scene are captured and transferred automatically to a pc or laptop either via a USB cable, or wirelessly, and it takes only a couple of seconds for even large 1MB images to be downloaded from the camera. If the laptop or pc is accessible over the internet, then images can be selected and uploaded to a remote server, and of course the camera window can be monitored live.

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