This file is for the guest of this site only to jump into correct index page. Remark: Some rental servers do not have file-type-name 'index.shtml' in DirectoryIndex, and user should not add the file type 'shtml' in ".hcaccess" file. If a host user wish to use SSI and let his guests be able to omit typing full file name (index.shtml) after domain name, (i.e. type '' instead for type full '') this file must be put in root directory, not to be forced to jump into server's default index page.