text Textual information. Subtypes include plain, html, and xml.
image Image data. Subtypes are defined for two widely used image formats,
jpeg and gif, and other subtypes exist as well.
audio Audio data. Requires an audio output device (such as a speaker or headphones)
for the contents to be heard. An initial subtype, basic, is defined
for this type.
video Video data. The subtype mpeg is often used. Typically, videos are not
transferred directly, but are read from an embedded object, such as a
JavaScript or Adobe Flash object.
application Any binary data. The subtype octet-stream is typically used.