A What is the significance of the Poincaré conjecture?

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What is the significance of the Poincaré conjecture?
Namely, what does Perelman’s proof of it imply?
 
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Wikipedia said:
The proof of the Poincaré conjecture is an important contribution to the classification of all 3-manifolds. This is because Perelman actually proves the more general geometrization conjecture over closed 3-manifolds, which includes the Poincaré conjecture as a special case.
And it proved that Perelman is a very special person.
 
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