The most popular use of webcams is the establishment of video links, permitting computers to act as videophones or videoconference stations.
Other popular uses include security surveillance, computer vision, video broadcasting, and for recording social videos.
Special software can use the video stream from a webcam to assist or enhance a user's control of applications and games.
Video features, including faces, shapes, models and colors can be observed and tracked to produce a corresponding form of control.
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).