An .xps file is an XML Paper file specification that describes the structure and content of a document, including layout and appearance. XPS files can be single page or multiple pages. XPS files were first implemented as a replacement for the EMF format and are somewhat similar to Microsoft's version of PDF, but are based on XML instead. Because of the structure of XPS files, their document description does not change depending on the operating system or printer, and is consistent across platforms.
The Portable Document Format (PDF) is a versatile file format that preserves the fonts, images, and layout of the original document, regardless of which of many platforms and which of many applications the document was created on. It was initiated by Adobe and was originally intended for electronic presentation of printed materials. PDFs look the same no matter what device they are viewed on. Whether you're using Windows 10, Mac, Chrome OS, Android, Windows Phone, iPad, or Windows XP - on any software or hardware, PDFs remain the same.