Skype is an application which lets users make phone calls or video calls for free or at very low cost via the Internet.
With Skype you can share all kinds of files freely, and you can also sign in with your Messenger user name, so you have all your Messenger and Hotmail contacts together in a single application.
Just start your Skype session, add your contacts and then you can make voice calls and free video calls to people who are online. If you deposit money in your account, you can also make calls to any landline or mobile phone at very affordable prices.
Good call quality, low prices.