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XPath (XML Path Language) is a query language for selecting nodes from an XML document. The language uses path expressions to navigate through the hierarchical structure of an XML document and filter out relevant data. XPath syntax is similar to directory paths in file systems and allows users to choose nodes or node-sets based on their location relative to other elements within the document. It's frequently used in combination with XSLT (eXtensible Stylesheet Language Transformations) for transforming XML documents into different formats, such as HTML or plain text, or extracting specific information from complex XML structures for use with other applications.