Skype is an application that allows you to make voice and video calls, make online conference calls, send text messages, and share files -- all at no cost. It's a great tool for working on projects with colleagues or classmates and for faculty holding virtual office hours. All you need is a broadband internet connection, a Skype account, the free Skype application, a microphone, and a webcam.
More advanced options are available at a competitive cost, including sharing your computer screen over the Internet, group video calls, telephone calls (to land lines or mobile phones), and SMS (text messaging to mobile devices.
What can you do with Skype?
Make a Skype to Skype voice call
Make a Skype to Skype video call
Make a Skype audio conference call