a piece of software that reads an XSLT stylesheet, reads an input XML document, and builds an output document by applying the instructions in the stylesheet to the information in the input document
a program that applies an XSLT style sheet to a tree representation of an input document, and creates a result tree based upon the style sheet's instructions
a species of XML processor that can take as input, both arbitrary XML documents, and stylesheets ("transformation specifications") as described in the XSLT Recommendation, and perform operations on them also as described in the Rec