Skype

What is Skype?
Call, video call, message and share with others wherever they are.

This is completely free:

• Skype account and latest downloads.
• Voice calls and video calls with other Skype users.
• Send instant messages and share files.

... and you have to pay for it

• Calls to mobiles and landlines worldwide at low rates.
• Send SMS messages at low rates.
• Group video calls for up to 10 people.

Features:
Calling

• Skype-to-Skype calls
• Calls to landlines and mobiles
• Group calls
• Skype number
• Call Forwarding
• Caller ID
• Skype To Go
• Skype call with one click

Video

• Personal video calls
• Group video calls

Messaging

• Videomessages
• Sending instant messages
• Sending SMS messages
• Voice messages
• GroupMe

Sharing

• Sending files
• Screen sharing
• Group screen sharing
• Sending contacts

More

• Go straight from Skype to Facebook
• Skype WiFi
• Skype Manager
• Skype Connect

More at http://www.skype.com/cs/what-is-skype/