If you have ever wondered what SU Binary is, you should know that it is a file that is installed when you try to root your device using certain kinds of tools. It is a file that is necessary for being able to get SU or Super User permission.
Tool for checking if a a device is correctly rooted
To find out whether your smartphone is correctly rooted or not you can downlaod an application like SU Binary Check, with is used to see if your device has this file that is essential for being able to be an Android Super User.
The app's functioning is very simple. You just have to display the menu on the left and tap on the Task button. Once you have done that a message will appear saying whether the file is on your device or not.
As you already know, being an Android Super User has certain advantages, such as being able to access operating system functions which are not normally available to all users and which allow you to further customize your device's functioning.