it is a configuration file for use on web servers running the Apache Web Server software. When a ‘.htaccess’ file is placed in a directory which is in turn ‘loaded via the Apache Web Server’, then the .htaccess file is detected and executed by the Apache Web Server software. These .htaccess files can be used to alter the configuration of the Apache Web Server software to enable/disable additional functionality and features that the Apache Web Server software has to offer. These facilities include basic redirect functionality, for instance if a 404 file not found error occurs, or for more advanced functions such as content password protection or image hot link prevention. This is a fairly advanced example: it enables password protection on the directory; it offers redirection to a custom error page if a user fails to login correctly; and it enables SSI (server side includes) for use with ‘.html’ files.