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JFIF is a graphical data format that enables the exchange of compressed JPEG files between computers. The main feature of the format is the use of a marker to indicate parameters that are not used in the JPEG standard, namely, pixel geometry, pixel size and some other parameters.

Is an e-book format developed for the Psion Series 3 platform used in the 1990s. It contains text and its formatting parameters. This e-book format was used exclusively in Psion devices.