A style2tagmap topic is the primary configuration file for the Word2DITA process. It maps Word paragraph and character styles to DITA elements. The Word2DITA process will use those mappings to generate resulting DITA file(s). It is often necessary to do further clean up work. The style2tagmap type should not be used for other means.
For more information, see the Word2DITA section of the DITA4Publishers User Guide.