The standard document properties are:

Author, Title, Subject, Keywords, Category, Status, and Comments

However if you take a look at the advanced properties then you will find a large number of additional options are available for you.

So what can you use document properties for?

The properties are information about the document. For example the comments field can be used in a review process to make notes about possible changes. Fields like keywords, subject and category can be used for making search and indexing more effective. You might wonder how this is going to help you. Well Windows Explorer can display document properties for you. In Windows Explorer select the details view  and right click on the column headings. You will see a short list of common properties and there is a ‘more option ‘ from which any property can be selected. You can now customise your view of the documents to contain properties like status, subject, and category. These can all be put into order. Suddenly your documents can be cross-referenced in a manner that means something to you.

Document properties lets you improve your knowledge of a document inside and outside of Word and this can make your life much easier.

It also works for any MS Office application, and most other files too.