QUESTION: What is XPS?
ANSWER: XPS stands for "XML Paper Specification." Formerly code-named "Metro Print Path," XPS is an XML-based file format that was developed jointly by Microsoft and UK-based Global Graphics Software.
The "XPS Document Format" is a paginated, fixed-format representation of electronic documents. Also known as "Metro Reach," XPS Document Format is an open, cross-platform document format that allows users to create, share, print and archive documents.
Support for the XPS Document Format is included in Windows operating systems since and including Windows Vista.
See also What is XML?