这项服务能免费让用户通过互联网在苹果设备之间同步文档，照片和应用程序。
The free service lets users synchronize documents, photos and applications between Apple devices over the Internet.
实际上，苹果公司的文档推荐不要依赖于它的存在，所以在将来，它有可能完全消失。
Indeed, their documentation recommends against relying on its presence, so it may vanish altogether in a future version.
举例来讲，如果你收到了一份Word文档附件，而且你已经安装了苹果Pages文字处理器，你就可以把文件传送给Pages，进而进行存储和编辑。
For example, if you receive a Word-document attachment, and you have Apple's Pages word processor installed, you can send it to Pages, where it can be stored and edited.
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