It is used when we wise to say that a person
or a thing is superior to all others in a
particular quality.

[A]The superlative degree is something used,not to
make a direct comparison but to express high degree
of the quality of the adjective.

It was the prettiest little doll,

[B]The superlative degree is preceded by the
and followed by of. Where direct comparison is
not made of is not used.

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[C] Adjectives like round,perfect.square,unique
have no comparative and superlative degree,for
one thing cannot be more round,square,unique or
perfect than another