PDF compresses documents to become smaller. This is why PDF documents have proper layout and easy to read. It is also important to note that with PDF, you can also easily integrate images, hyperlinks and other non-text elements.
In an office environment, several sensitive documents are shared and that is why they are normally shared using PDF because it provides the protection. For instance, PDF is well secured in such a way that gives you the option of using password to lock you file.
This is because PDF has a lot of good features. The advantages of using PDF over word cannot be overemphasized. Not only is PDF very popular, it has a wide range of application and features in such a way that someone will just have to use PDF to share documents at some point.
There is actually no doubt that no other document format has proven to be superior to PDF. However, they are almost the same with just some little variation especially for newer version of word but it is not anything to be worried about. It is important to note that some of this steps highlighted to insert Word document into Word may vary depending on the version of word.