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A webcam (web camera or PC camera) is a low-priced digital video camera that is connected to an Internet computer and that, combined with software, enables online video communication. There are two ways in which webcams are most commonly used:

Videoconferencing (two-way webcams). People communicating in groups of two or more on the Internet via means such as instant messaging services, Internet telephony, and online chat rooms may enhance the process by adding live video imagery of themselves. This creates a two-way video-based process of communication that often also uses an audio channel and is similar to a face-to-face conversation.

One-way webcams. The typical way of using a webcam is for uploading images onto a Web server, continuously or at regular intervals. In this context, not only the actual video cameras but also the websites that feature the one-way imagery are referred to as webcams (or live-cams). By analogy to broadcasting, this process is called webcasting to emphasize the fact that image content is publicly distributed on the Web via webcams. The live webcam videos may be watched using Web browsers. This way of using webcams represents a one-way process of communication. Webcam operators, both individuals and organizations, provide live public video imagery for a large audience. The spectrum of topics and motifs is wide. One-way webcams usually do not transmit any sound.

The quality of the images transmitted by webcams is limited and depends on the recording conditions (e.g., lighting), the camera, the software, and the bandwidth of the Internet connection. In recent years, both the efficiency of PC cameras and the bandwidth of Internet connections have increased noticeably.

Prevalence of Webcam Use

The U.S. marketing company, IDC, estimated that 18 million webcams were sold in the year 2004; the market leader for webcams is Logitech.

In a representative telephone inquiry among adult Internet users in the United States in 2003, 7% of those surveyed were operating a one-way webcam of their own. There are more than twice as many webcam viewers as active webcam operators. According to a Pew Internet and American Life Project survey conducted in 2005, one out of six adult Internet users in the United States (16%) had viewed webcam content. The male rate (19%) is slightly larger than the female rate (13%). Webcam viewing was equally popular in all parts of the population, independent of age, income, education, and number of offspring. Statistical data concerning webcam usage by children and adolescents is yet to be published.

Webcam Content

In 1991, computer science students from Cambridge University launched the first webcam mentioned in the literature. It displayed images of a coffee pot shared by several academics in a laboratory, thus enabling them to see on their computer desktops in their respective offices when the coffee had run through (as the laboratory was called the Trojan Room, this became known as the Trojan Room coffee pot).

The best-known webcam was the so-called JenniCam, begun in 1996 by 20-year-old college student Jennifer Ringley and operated until 2003. Jennifer equipped her apartment with several webcams and filmed her own private everyday life uncensored around the clock. The live imagery was initially available online without charge and was viewed and discussed in Internet forums by a large fan audience. The video imagery consisted of captured still images, updated once per minute. A membership fee was charged for more frequent updating of the images. Webcam operators' use of the domestic video monitoring model (home cam) may have several motives. Some are driven by the desire for attention and fame, by the urge to experiment with new technology, and by the prospect of financial benefits. The homecam concept has also been adopted as a TV format (e.g., in the reality show Big Brother).

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