1, The Full Form of DOCX is Documents.
A document is a written, drawn, presented, or memorialized representation of thought, often the manifestation of non-fictional, as well as fictional, content. The word originates from the Latin Documentum, which denotes a “teaching” or “lesson”: the verb doceō denotes “to teach”.
2, DOCX is a file extension for Microsoft Word.
A file with the DOCX file extension is a Microsoft Word Open XML Format Document file.
DOCX files are used for everything from resumes and cover letters to reports, flyers, documentation, invitations, newsletters, and more. These files usually contain text but can also include objects, styles, rich formatting, and images.
Microsoft started using DOCX files in Microsoft Word beginning in Word 2007, while earlier versions of Word use the DOC file extension.