What does an eps file do?
Many graphics and illustration programs, as well as many image-editing programs, provide specific commands for saving a page as an EPS file. When created from direct commands, EPS files typically combine into a single file the primary data file and all linked graphic and image files, but not font files. When created in this manner, all printer font files used by the primary data file must be provided to Reliable Graphics in addition to the EPS file for proper output.