PDF (Portable Document Format) is a versatile electronic document format. It was initiated by Adobe and was originally intended for electronic presentation of printed materials. Hence, the tasks of this format follow - storing information about the color scheme and the arrangement of elements, as well as ensuring identical output on different monitors and printers. PDF documents can be opened using the free version of Adobe Reader or a web plug-in that is available for most Internet browsers. In some browsers, in particular, in Google Chrome, this format is supported even without the plugin installed. You can edit PDF files using the paid version of Adobe Reader. Also, there are a huge number of programs for both opening and working with this format, and for converting to other formats.
A Microsoft Word document is a doc or docx file. Until the 1990s, the doc extension was used for text files that did not contain markup. And now you can make sure that this type of file can be easily created using, for example, the Notepad program. True, it will not have rich formatting, but it can be easily opened by the Word program, in which the text typed in a notebook can be given a more decorated look. When Microsoft released Word, the developers decided to use the doc extension in it. By now, this text editor is the most popular in the world, so a file with the doc extension is associated with this software product and is simply called the Word format.