By default you will find a htaccess.txt file in the Joomla folder which you need to rename to .htaccess so that you can enable Search Engine Friendly URLs. As long as the file is in htaccess.txt, it will have no effect on the Joomla site.
If you don’t rename it and enable the SEF URLs in the Joomla Administrator, you will find 404 errors in the frontend of the website . If you have any problems regarding this you may contact us.