Have you ever heard of a hidden panel or gone there to see what is there ? Yes, there is an admin page that is not listed in wp menu. Go to http://yourdomain.com/wp-admin/options.php and you will see something like this image below.
Well, you see there is big list of data, you may wonder what these are. These are actually options and settings that have been used by your site or installed plugins. Some of these data is editable from somewhere of your admin panel while in while others are not.
Well, this is the list of data here you should not change any of it from here in general unless you fall in a problem for any option that you know , and you don’t find other way to change it.