The number of registered users of Skype was about 50 million in 2005 and increased more than 10-fold to more than 600 million just five years later. Luxembourg-based Skype Technologies, founded by Niklas Zennström of Sweden and Janus Friis of Denmark, first introduced the software client in 2003. Skype was one of the early successes in using the voice-over-Internet protocol ( VoIP). Skype, software for communication over the Internet, which includes voice, video, and instant message capabilities.

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