What is the meaning of "It's the thought that counts"?

[Alimysoul]

what is the meaning and this common use

It's the thought that counts

[Mister Micawber]

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'It's the thought that counts' is usually used of gift-giving. It doesn't matter how little a gift costs; what is important is the feeling or thoughtfulness that the giver is expressing.
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Native English teacher at Mister Micawber's