Videotelephony comprises the technologies for the reception and transmission of audio-video signals by users at different locations, for communication between people in real-time.

At the dawn of the technology, videotelephony also included image phones which would exchange still images between units every few seconds over conventional POTS-type telephone lines, essentially the same as slow scan TV systems.

Currently videotelephony usage has made significant inroads in government, healthcare, education and the news media. It is particularly useful to the deaf and speech-impaired who can use them with sign language and also with a video relay service, and well as to those with mobility issues or those who are located in distant places and are in need of telemedical or tele-educational services.

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

The concept of videotelephony was first popularized in the late 1880s in both the United States and Europe, although the sciences to permit its very earliest trials would take nearly a half century to be discovered. These evolved from studies and experimentation in the fields of electrical telegraphy, telephony, radio and television.

Ryan Benjamin Tedder (born June 26, 1979) is a Grammy Award winning singer-songwriter and record producer. He is best known as the frontman of the pop rock band, OneRepublic, though he has an independent career as songwriter and producer for various artists such as Adele, Jennifer Lopez, Beyoncé, B.o.B., Kelly Clarkson, Far East Movement, Adam Lambert, Jordin Sparks, Leona Lewis, Gavin DeGraw, Demi Lovato, Sebastian Ingrosso, Maroon 5, and Paul Oakenfold.

Born in Tulsa, Oklahoma, Tedder was raised by an extended family of missionaries and pastors and grew up in the church. He began learning to play the piano at the age of three via the Suzuki method. His early interest in music was prompted by his musician father and school-teacher mother, who coaxed their young son into practicing piano in exchange for candy corn. Tedder started singing at the age of seven. A self-taught vocalist, Tedder began honing this skill at the age of twelve by imitating his favorite artists, who ranged from The Beatles to acts as diverse as Peter Gabriel, Stevie Wonder and Sting. He has commented, "I sang for two hours a day every day of my life until I was eighteen." He continued to perform musically during his adolescence through church, school, and personally formed groups.

Eric Sheridan Prydz (born July 19, 1976) is a Swedish DJ and producer based in London, United Kingdom. The pronunciation of his surname is often questioned; it is pronounced "prids", but when under his alias, Pryda, it is pronounced "pride-ah". In October 2011, DJ Magazine announced the results of their annual Top 100 DJ Poll, where Prydz placed at #46.

Until recently, Prydz had only played shows in and around Europe as he has a fear of flying. In December 2008, Prydz was forced to cancel several dates in Australia, New Zealand and Malta after panic attacks prevented him from boarding the outbound flight.

On Armin van Buuren's radio show "A State of Trance" in February 2011, it was announced that Prydz recently became a father.

His debut live show called "EPIC" (Eric Prydz in Concert) was held on April 2nd, 2011 at the O2 Brixton Academy Arena in London where he played most of his own production, as well as unfinished and upcoming tracks. The second show was at Global Gathering on July 29th and the third instalment at the Alexandra Palace on November 26th.