: DOCX files are compressed XML-based archives (essentially a renamed .zip file), making them much smaller and easier to share than older .doc formats.
: They allow for seamless integration of multimedia, such as images, videos, and complex charts, to enhance document quality. XYZ ZRT.docx
If you are instead asking about the general features of a file format (which your file uses), here are the most useful capabilities: : DOCX files are compressed XML-based archives (essentially