Skype is a software application based on web 2.0 that allows users to make Voice calls, Text, Video sharing, Screen sharing, File transfers and Conference Calls over the Internet with the people globally located.
It also offers features such as voicemail and call forwarding.
Skype accounts are estimated to be at 250 million users worldwide and the users are from diverse fields like academics, research, engineering, businesses and people generally keeping in touch around the world.
Skype is free for download ( http://www.skype.com ) and it is free for use between people in the world who have Skype on their computer or phone .
While calls to other users within the Skype service are free , calls to both traditional landline telephones and mobile phones can be made for a nominal fee using a debit-based user account system (wikipedia.org).