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By reducing the need to travel to bring people together, this technology also contributes to reductions in carbon emissions, thereby helping to reduce global warming.
Videoconferencing implies the use of this technology for a group or organizational meeting rather than for individuals, in a videoconference.News media organizations have begun to use desktop technologies like Skype to provide higher-quality audio than the phone network, and video links at much lower cost than sending professional equipment or using a professional studio.More popular videotelephony technologies use the Internet rather than the traditional landline phone network, even accounting for modern digital packetized phone network protocols, and even though videotelephony software commonly runs on smartphones.Videotelephony developed in parallel with conventional voice telephone systems from the mid-to-late 20th century.Very expensive videoconferencing systems rapidly evolved throughout the 1980s and 1990s from proprietary equipment, software and network requirements to standards-based technologies that were available for anyone to purchase at a reasonable cost.A number of organizations believed that videotelephony would be superior to plain voice communications.
However video technology was to be deployed in analog television broadcasting long before it could become practical—or popular—for videophones.
Only in the late 20th century with the advent of powerful video codecs combined with high-speed Internet broadband and ISDN service did videotelephony become a practical technology for regular use.
In the 1980s, digital telephony transmission networks became possible, such as with ISDN networks, assuring a minimum bit rate (usually 128 kilobits/s) for compressed video and audio transmission.
This was first embodied in the device which came to be known as the video telephone, or videophone, and it evolved from intensive research and experimentation in several telecommunication fields, notably electrical telegraphy, telephony, radio, and television.
Simple analog videophone communication could be established as early as the invention of the television.
Such an antecedent usually consisted of two closed-circuit television systems connected via coax cable or radio.