Skype是创建Kazaa的组织在2003年开发的一个基于Peer-to-Peer(对等网络)的VoIP客户端。它可以几乎无缝的穿越NAT和防火墙，并且语音质量比其他的VoIP客户端软件要好很多。他加密了端到端的通话，分散式存储用户信息，支持即时消息通信和网络语音会议。

-Skype are creating Kazaa organization developed in 2003 based on Peer-to-Peer (peer-to-peer networks) VoIP client. It can be almost seamless across NAT and firewall, and voice quality than other VoIP client software much better. He had end-to-end call encryption, decentralized storage of user information in support of instant messaging and online voice communication session.