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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.

The concept of videotelephony was first popularized in the late 1870s in both the United States and Europe, although the basic sciences to permit its very earliest trials would take nearly a half century to be discovered.

Although not as widely used in everyday communications as audio-only and text communication, useful applications include sign language transmission for deaf and speech-impaired people, distance education, telemedicine, and overcoming mobility issues.

It is also used in commercial and corporate settings to facilitate meetings and conferences, typically between parties that already have established relationships.

During the first manned space flights, NASA used two radio-frequency (UHF or VHF) video links, one in each direction.

TV channels routinely use this type of videotelephony when reporting from distant locations.

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At the Winter Olympics opening ceremony in Nagano, Japan, Seiji Ozawa conducted the Ode to Joy from Beethoven's Ninth Symphony simultaneously across five continents in near-real time.

A videophone is a telephone with a video display, capable of simultaneous video and audio for communication between people in real-time.

Videoconferencing implies the use of this technology for a group or organizational meeting rather than for individuals, in a videoconference.

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.

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.

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