Skype is software that enables you to make free calls anywhere in the world. Skype uses P2P (peer-to-peer) technology to connect you with other users. It offers several features, including SkypeOut calling from Skype to regular and mobile phones worldwide, conference calling, and secure file transferring. You can also now share your screen with other users. Skype calls focus on video and audio quality, and secure the calls with end-to-end encryption.