The document discusses Skype and VOIP (Voice Over Internet Protocol). Skype allows users to make free voice and video calls over the internet. It has over 300 million users and accounted for 27.7 billion minutes of calls in 2009, over a third of which were video calls. VOIP converts voice calls into digital signals that can be transmitted over the internet, allowing users to make phone calls from computers or wireless networks. The document provides examples of how Skype and VOIP can be used both in educational and business settings.