MIME is an acronym for 'Multipurpose Internet Mail Extensions.' It helps identify a particular file format. Sometimes the file extension may not be available so that you can look at it and tell the file type. It is also a possibility that the extension is not accurate. In that case you have to look at the contents of the file and tell the file type. MIME type verifies the content inside the file and displays the file type. Therefore it is more accurate.