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Just one of the many nice features of XML is that it tends to be rather human readable when compared to most traditional proprietary or legacy binary data formats. Just open an Excel spreadsheet in Notepad and try to figure out what is meant by all the proprietary formatting codes. In XML, all those human-meaningful tags sprinkled throughout the document tend to visually jump out and help you to interpret the underlying meaning. This can go a long way in helping you sort your way through the complex morass that is so typical of most structured data that is processed by complex applications. The readability of XML can therefore often be a great benefit to programmers, who must frequently read XML input and output to help guide them during software development and testing. Of course, human readability is an advantage only if you in fact do intend for people to make visual sense of your data. Frequently, that is not the case, especially after the application is deployed and used for processing real-world sensitive data. Fortunately, XML encryption can be selectively applied to the sensitive elements contained within your XML documents. In this way, you can ensure that those parts of your data that need to be kept private are made unintelligible to unauthorized individuals.