Webcams,+Digital+cameras,+Digital+Video+cameras

__Input/Output?__ They are actually a source of Input usage.
 * __Webcams, Digital cameras, Digital video cameras__**

__How does it work?__ A webcam is a video camera that feeds its images in real time to a computer or computer network, often via USB, ethernet, or Wi-Fi. You simply plug it in and it takes time to configure, and then it will be ready to be used. The Digital camera/video camera have the same pronciples as well. They are both input sources (although the LCD screen could be counted as an output usage), you take the picture/video by using the lens.

__ Where is it used? __ The common webcam is used to intellect with others in a more precise way - it allows you to speak to a person and see the person (just like in MSN or Skype. A more famous example of the webcam in usage is on the "popular" reality TV show, Big Brother - there webcams were used to capture the contestants life in the Big Brother household. Digital video cameras are used to capture people in the daily life, or an important event i.e your childs nativity play. It can be used to capture film for the television as well (although the camera are normally very expensive for that matter).  Digital camera is used to capture images for newspapers or magazines - it is mostly used though from local people who just want a special pic of a special event.  All of these are also used in security as well, to track down people who have committed a crime. The most basic use for this is CCTV cameras. CCTV (Closed circuit television) differs from broadcast television in that the signal is not openly transmitted, though it may employ point to point (P2P), point to multipoint, or mesh wireless links. Though almost all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that may need monitoring such as banks, casinos, airports, military installations, and convenience stores( []).

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