What does 'That's the whole point' mean?

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Answer

It is an expression that means :
"That is the major issue or idea that explains and clarifies a certain situation  or action"
Example :
What is the whole point of this quarrel?  
( means ,what is the main reason for this quarrel  ("quarrel=fight")

Answer

我好像一直以来都认为, point 有 opinion, idea 的意思. 不知道这想法哪里来的

Answer

It means "that explains it all".