The .pub file extension is the file extension used by the Microsoft Publisher application which forms part of the Microsoft Office product set. A .pub file can contain images, graphics, formatted text and other objects. The file type is typically used for amateur publishing with professionals opting for higher end file types.
Microsoft Publisher files may contain various elements including images, graphics, formatted text and objects. The file extension has undergone a number of revisions, from version 3.0 for Windows 95 up to the current version 14 used by Microsoft Publisher 2010. A major disadvantage of the file type is its lack of portability. The file type cannot be opened by most other applications, including other Microsoft Office applications such as Microsoft Word. As such it is considered an inappropriate file type for sharing with others. However, it is noted that it is possible to view .pub files using the trial version of Microsoft Publisher.
PDF is a file format developed by Adobe Systems for representing documents in a manner that is separate from the original operating system, application or hardware from where it was originally created. A PDF file can be any length, contain any number of fonts and images and is designed to enable the creation and transfer of printer-ready output.
Each PDF file encapsulates a complete description of a 2D document (and, with the advent of Acrobat 3D, embedded 3D documents) that includes the text, fonts, images and 2D vector graphics that compose the document. They do not encode information that is specific to the application software, hardware, or operating system used to create or view the document.