For MS Word files (.doc and .docx), we use the Track Changes and the Comments features. You can access the Track Changes and Comments tools by clicking on the Review tab.
You can use the tools on the Review tab to Accept or Reject changes one by one, or you can Accept or Reject the changes all at once.
You can also right-click on individual changes in the document to access the Accept/Reject functions.
You can also delete the comments with the Review tab.
Right-clicking on a comment balloon also brings up a Delete Comment function in the fly-out menu.