Wtf exactly is kingdom hearts?!

[Sanjiboy]

does it grant a heartless person or nobody unlimited power or is it just eye candy in the sky?

 

[Byronic Hero]

It is the heart of all worlds, and the source of great power and wisdom. It can be seen as the heart of everything.

 

[Ventus Air-Man]

It is the Heart of all of the Worlds, and has immense light inside of it.

 

[WilliamTheWise]

Scratch that, the "Another Reports" details a glimpse into it's purpose.

I - Until now in the Kingdom Hearts (hereafter KH) Series, there have been 2 types of "Kingdom Hearts" referring to the Heart of Worlds and the Heart of Men, could you explain the mechanics of this?
Think of the basic setting of KH as "All life has a heart". The heart of a world can be considered the things of nature; for example, the trees in a forest, a sea or river, a flower and so forth. When they all come together to form a world a large heart will come into existence. And concerning the hearts designated to men, all the hearts of humans and animals living in the world are integrated. As for Kingdom Hearts, think of it as if the heart is essentially the culmination of an invisible "Proof of Life"

 

[Lady-Lee]

^
i believe that is the best explanation thus far that ive heard since the game was first introduced.

 

[The Fishman]

that interview with Nomura that William the Wise quoted is a really great item to back up an answer since it's coming from the creator itself.

 

[Sanjiboy]

indeed thats pretty much sums it up guys