A media type (also known as a Multipurpose Internet Mail Extensions or MIME type) indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF’s RFC 6838.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/MIME_types
type/subtype;parameter=value
Discrete types:
applicationaudioexamplefontimagemodeltextvideo