Media-type is the MIME Type is a two-part identifier for file formats and format contents transmitted on the Internet.

The Internet Assigned Numbers Authority (IANA) is the official authority for the standardization and publication of these classifications.

Media-type were originally defined in RFC 2045 in November 1996 as a part of Multipurpose Internet Mail Extensions (MIME) specification, for denoting type of email message content and attachments hence the name MIME Type.

Media-type are also used by other Internet protocols such as HTTP and document file formats such as HTML, for similar purpose.

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