FAX (Group 3 FAX)

The FAX file format introduced in the 1990's is a raster image file format intended to store digital versions of documents used by Fax (facsimile) machines that were popular at the time.

Although Fax machines have been slowly replaced since then by internet based communications such as Email and Instant Messaging the FAX file format is still used for certain applications and the files can be edited within some 3rd party applications.