PDF files can contain both text and images. There is quite a common case where the PDF file contains only images, when it is derived from scanning physical text or images. The other extreme is where the PDF only contains text. Text can usually be selected and copied to the clipboard - it can then be pasted into a Word document. If the PDF is a scanned image of text, you will have to use optical character recognition (OCR) software to convert the image into text - you can then save that as a Word file. OCR is usually not totally reliable, so you will have to edit the converted text. If you don’t want all this hassle, there are a number of online services for converting PDF files to Word - Google them.