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Webcams can be used to take video clips and still pictures.Various software tools in wide use can be employed for this, such as Pic Master (for use with Windows operating systems), Photo Booth (Mac), or Cheese (with Unix systems).They have also become a source of security and privacy issues, as some built-in webcams can be remotely activated by spyware.The most popular use of webcams is the establishment of video links, permitting computers to act as videophones or videoconference stations.For a more complete list see Comparison of webcam software.Special software can use the video stream from a webcam to assist or enhance a user's control of applications and games.Other popular uses include security surveillance, computer vision, video broadcasting, and for recording social videos.
Small webcam-based PC games are available as either standalone executables or inside web browser windows using Adobe Flash.
The term "webcam" (a clipped compound) may also be used in its original sense of a video camera connected to the Web continuously for an indefinite time, rather than for a particular session, generally supplying a view for anyone who visits its web page over the Internet.
Some of them, for example, those used as online traffic cameras, are expensive, rugged professional video cameras.
Video features, including faces, shapes, models and colors can be observed and tracked to produce a corresponding form of control.
For example, the position of a single light source can be tracked and used to emulate a mouse pointer, a head-mounted light would enable hands-free computing and would greatly improve computer accessibility.
With very-low-light capability, a few specific models of webcams are very popular to photograph the night sky by astronomers and astro photographers.