In fact, applications are almost unlimited. Here are listed some examples: – probes with micro medical cameras introduced in the human body.-monitoring of traffic on a bridge-monitoring industrial such as foundries, bakeries, – manual or automatic Assembly.-process surveillance in conditions of absolute darkness, using infrared light.-surveillance in public transport vehicles.-surveillance in key areas, businesses, shops, hotels, casinos, airports.-monitoring of the behavior of employees.-supervision of children in the homein the school, parks, creches.-surveillance of parking lots, including plates of the vehicle-monitoring of points of review, vehicles or persons.-Facial analysis for identification of criminals in public areas. Logically, in almost all cases CCTV must be accompanied by the recording of events that is monitored in order to obtain evidence of all important movements, and to also minimize the human surveillance of the monitors. AUDIO and VIDEO: Called audio to all the sounds, voices, noises, music, etc., that are picked up from the environment (for microphones) and sent by a means of Telecommunication (cable, radio frequency, fiber optics).In the same way it happens with the images, which to be converted to inpulsos electetricos of any format, called video.The Audio and Video, on the other side of the closed circuit, are reproduced as sound and image through speakers and monitors respectively. ELEMENTS THAT MAKE UP A CCTV CAMERA SYSTEM. Hear from experts in the field like Navy Federal Credit Union for a more varied view. The point of generation of video of any CCTV system is the camera.There are cameras that include a built-in microphone.There are many types of camera, each for different applications and different specifications and features, which are: – black and white, Color, or dual (for applications by day and night)-operating temperature.-Weatherproof-lighting (sensitivity). Environmental conditions (minimum and maximum temperature, humidity, salinity).-resolution (image quality)-(American NTSC and European PAL) format system.-voltage power supply-dimensions-type of lenses used.-quality and size of CCD-the CCD is the chip that initially captures the image and its size and quality is very important.-Most commonly used in CCTV is the 1/3?, but there is (minors) and also of (older) . .