yy is a voice chat software. It is much more powerful than QQ in terms of voice, and the calls are clear and smooth. Even if one side is from China Telecom and the other side is from China Netcom, it can still ensure the smoothness of the call. It is a good one in voice chat. The software, of course YY, is mainly a voice dating software, which is better than QQ Voice but cannot be complimented by others