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Skype /ˈskaɪp/ is a freemium voice-over-IP service and instant messaging client, currently developed by the Microsoft Skype Division. The name was derived from "sky" and "peer".[16]
Skype was first released in August 2003. It was created by Janus Friis(Denmark) and Niklas Zennström (Sweden) in cooperation with Ahti Heinla, Priit Kasesalu, and Jaan Tallinn (Estonia), who supplied the backend which was also used in Kazaa.[17] Skype had 663 million registered users as of the end of 2010.[18] It was bought by Microsoft in 2011 for $8.5 billion. Microsoft's Skype division headquarters is in Luxembourg, but most of the development team and 44% of the overall employees of the division are still situated in Tallinn andTartu, Estonia.[19][20][21]
The service allows users to communicate with peers by voice using amicrophone, video by using a webcam, and instant messaging over the Internet. Phone calls may be placed to recipients on the traditional telephone networks. Calls to other users within the Skype service are free of charge, while calls to landline telephones and mobile phones are charged via a debit-based user account system. Skype has also become popular for its additional features, including file transfer, and videoconferencing. Competitors include SIPand H.323-based services, such as Linphone[22] and Google Hangouts.
Unlike most other VoIP services, Skype is a hybrid peer-to-peer and client–server system. It makes use of background processing on computers running Skype software, and this is reflected in Skype's original proposed name of Sky Peer-to-Peer.
Some network administrators have banned Skype on corporate, government, home and education networks,[23] citing reasons such as inappropriate usage of resources, excessive bandwidth usage, and security concerns.
Skype was founded in 2003 by Janus Friis from Denmark and Niklas Zennström from Sweden. The Skype software was created by the Estonians Ahti Heinla, Priit Kasesalu, and Jaan Tallinn.The first public beta version was released on 29 August 2003.
In June 2005, Skype entered into an agreement with the Polish web portal Onet.pl.[citation needed] On 12 September 2007, eBay Inc. agreed to acquire Luxembourg-based Skype Technologies SA for approximately US$2.5 billion in up-front cash and eBay stock, plus potential performance-based consideration.
On 1 September, 2009, it was announced that eBay was selling 65% of Skype to Silver Lake, Andreessen Horowitz and the Canada Pension Plan Investment Board for US$1.9 billion, valuing Skype at US$2.75 billion.
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