经常使用某种服务时，你想知道你在跟谁说话，例如当你的网上银行使用证书和SSL验证你是真正的银行网站。
Often when using some kind of service you want to know for sure who you are talking to, for example when you do online banking you use certificates and SSL to verify you are on the real Banks website.
一项最近的调查显示，69%的上网的美国人使用某种“云服务”，包括网上电子邮件或在线数据存储(图2)。
According to a recent study, 69% of Americans connected to the web use some kind of "cloud service", including web-based E-mail or online data storage (see chart 2).
在很多情况下，Web服务开发实际总是开始于现有代码，使用某种老技术实现服务。
In many cases, web service development is actually starting from existing code anyway, in the form of services implemented using some older technology.
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