What is it?
Voice over Internet Protocol systems such as Skype use networks such as the internet to channel digital communication - usually voice calls and video conferences. The key features are that the calls are free when connected to a peer (another subscriber), and tend to be very clear in terms of auditory quality.
Skype was originally developed by Estonian programmers who had been involved with the file-sharing group Kazaa, and grew into a Swedish-based company. In 2005 it was acquired by eBay for $2.6 billion. eBay encourages customers to include Skype contact details in their auction listings. More and more retail and service companies are listing Skype details on their webpages to encourage dialogue with customers.
Several instant messaging (IM) systems also offer VoIP, in particular Yahoo Messenger and MSN (now known as Windows Live). Yahoo adds value to IM through VoIP as well as services such as Yahoo Radio. Microsoft's proposition includes integrating messaging and VoIP with their gaming system XBox.
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