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Skype is a telecommunications application software that specializes in providing video chat and voice calls from computers, tablets and mobile devices via the Internet to other devices telephones. Users can also send instant messages, exchange files and images, send video messages and create conference calls. Skype is available to download onto computers running Microsoft Windows Mac or Linux as well as Android Blackberry iOS and Windows Phone smartphones and tablets. Much of the service is free but users require Skype Credit or a subscription to call land-line or mobile numbers. 

Skype registered users are identified by a unique user name and may be listed in the Skype directory Skype allows these registered users to communicate through both instant messaging and voice chat whic allows telephone calls between pairs of users and conference calling, in Skype text chat allows group chats, emoticons, storing chat history and editing of previous messages and much more...