Skype is a free download that lets you use your computer to make telephone calls. Calls from one Skype user to another are free, wherever they are in the world. You make calls using usernames rather than traditional phone numbers, and an instant-messaging client (for text chatting) is included. There are a number of paid add-ons: SkypeOut, for calling ordinary phones; SkypeIn, which provides a real phone number so non-Skype users can call you; and Skype Voicemail, to answer your calls when you are away from the PC. With these services, Skype can provide its users with a rich set of features at low cost. This is a business version of Skype.