Web document formatted using the MIME HTML or "MHTML" standard; encodes images and other media files referenced by a .HTML document into the same file the HTML is stored in; the data is encoded using .MIME encoding.
Most Web pages viewed in a Web browser only contain HTML and reference images and other media files that are stored in other directories on the server; because all the files are encoded into a single file in a MHTML document, MHT files are commonly used to archive Web pages.