which file is the config file of http server?

It seems the config file of http server is /etc/apache2/httpd.conf. for example, I changed the status(disable/enable) of some http server module at yast. the file /etc/apache2/sysconfig.d/loadmodule.conf is modifed, add or delete a line beginning with LoadModule. and /etc/apache2/sysconfig.d/loadmodule.conf is include at /etc/apache2/httpd.conf. But /etc/httpd/httpd.conf isn't be modified. So what is /etc/httpd/httpd.conf for? Pearly