These definitions are used with cmd_access(). ADMIN_ALL means that the function will return true for all users. ADMIN_USER will only return true for non-admins (those with the 'z' flag which is given to non-admins by default).
So, that means it's possible to make commands that can only be used by basic users (non-admins).
Oh Okay I was Idiot But he Didnt specify Things and made them more Clear Any ways Thanks For Your help