Overloaded operator

I was not able to get what was explained from 9:20 lexogrphic and overloaded operator

have you know about operator overloading?
then it will be easier to understand

operator like > is used only for fundamental data types like int,char etc.
but to use them in our own obj we have to overload the operator
same thing is done in string class
hence we can use these operators in string object as well
like s1>s2

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