What is skype? Is it free?

Skype is a software application that allows users to make voice calls over the Internet.
Calls to other users within the Skype service are free PC to PC, but calls to both traditional landline telephones and mobile phones (i.e. PC to phones) can be made for a fee using a debit-based user account system.

skype is one of the most famous chat and voice chat client all over the world which is very reliable, fast and gives free skype to skype call.. It is the only application which is supported to be installed on mobile phones so that you can call each other from skype to skype using your mobiles as well...

from skype to skype it is totally free anytime anywhere from PC. If you use it  from mobile, network may charge for Internet charges... other than that.. you can purchase credit from skype to make calls to other networks and abroad very very cheap