DOCX
DOCX is the modern Microsoft Word format — an XML-based document inside a ZIP container. It supports tracked changes, comments, embedded media, and rich formatting, and opens in Word, Google Docs, LibreOffice, and Pages. DOCX is the right format whenever a document still needs editing; PDF is for the finalized version.
PDF
PDF (Portable Document Format) freezes a document’s exact layout so it looks identical on every device. It is the contract, invoice, eBook, and academic-paper format of record. PDFs can hold text, vector graphics, raster images, forms, and digital signatures — but editing them outside specialized tools is painful, which is why PDF-to-Word is one of the most-searched conversions.