Skype a is voice over IP client which you can install on many different operating systems (PCs and other devices). You can call phone numbers (land line and cell) at a very low price or conduct voice/video chat to other computers for free. You can also do conference voice/video calls with more than one person at a time with the upgraded membership. basic membership is free which is one on one voice/video chatting. See the following link for more information. Hopefully, this is the language best for you. http://www.skype.com/intl/zh-Hans/home