Skype is a software application that allows users to make video and voice calls over the internet for free. It also offers messaging and file sharing. Skype can be used on many devices as long as they can connect to the internet. The document provides information on creating Skype accounts, making calls, and features. It also describes how Skype can be used in educational settings for connecting classrooms, guest lectures, and international learning opportunities. Several example classroom projects utilizing Skype are outlined.