The Skype program works on computers Microsoft Windows, MacOS and Linux and is available as mobile apps for different platforms including iOS and Android. By using VoIP to make the calls, it is very cheap to call another phone. It does not cost money to call another Skype user. Every Skype user has a unique name by which other users can find and talk to. Skype also has additional features such as video calls and multiple members in a conversation. In the chat you can also find a selection with a variety of emojis available.