A multipurpose Internet mail extension, or MIME type, is an Internet standard that describes the contents of Internet files based on their nature and formats. This cataloging helps the browser open the file with the correct extension or plugin. Although the term includes the word "mail" for e-mail, it is also used for Web pages.
How to use the Get MIME Type (file extension) plugin to find the type or extension of a file
MIME types consist of two parts: a type and a subtype.
This is the MIME type for HTML:
MIME types are defined in HTML by the type attribute in links, objects, and script and style tags.