A desktop publishing application from Microsoft that focuses on page layout and graphic design.
You can install a PC version of Publisher on a Mac using Parallels.
As per Charles Kenyon, Reference: https://www.macoszon.com/open-publisher-files-on-mac/ and https://machow2.com/open-publisher-file-on-mac/
You can't edit a Pub file without Publisher and there is not a Mac version of Publisher. Your workarounds include:If you have Publisher you can Save As the *.pub file as a Word file though the formatting and layout will likely be skewed. If you only need to view the file on a Mac you could also convert to a PDF. Reference: http://www.zamzar.com/ Free online file conversion which will convert a .pub file to a .doc file or a PDF.
Alternatively, check out Affinity Publisher. This is the newest version of the old Serif DTP, and it is what I wish MSFT had done with Publisher. In your case the advantage is it will run on both PCs and Macs. They have a free trial and a relatively inexpensive purchase price.
DavidF