XSLT is a rule based language used to transform XML documents in to other file formats. XSLT are nothing but generic transformation rules which can be applied to transform XML document to HTML, CS, Rich text etc. the XSLT processor takes the XML file and applies the XSLT transformation to produce a different document.

XPATH It is an XML query language to select specific parts of an XML document. Using XPATH you can address or filter elements and text in a XML document. For instance a simple XPATH expression like "Invoice/Amount" states find "Amount" node which are children of "Invoice" node.