Skype is a program which allows you to make calls on the internet for free. The software already supports many features that are also available with a traditional phone. These features include, for example, conference calling and call forwarding. With Skype you can also call landlines and mobile phones, but this is no longer free. Furthermore, Skype also supports instant messaging and file transfer. To ensure a high level of security Skype encrypts all calls, instant messages and file transfers.