Acronym for Multipurpose Internet Mail Extensions
The format for modern email messages, this specifies how to encode attachments, and non-text bodies. It also includes a type system, allowing type information to be included with message parts, and a means of specifying non-ASCII text in message headers.
The MIME standards build on the message format specified in RFC:822 (now updated to RFC:2822), so a MIME message is also an RFC:822 message, hence can be sent using standard internet protocols (such as SMTP)
1? There are a bunch of additions, but these include most of the important basics