What is this iPhone 6 feature?

I recently got the iPhone 6, and i've stumbed across something I don't understand.

When I double press (without pushing the button down, as if I was scanning my fingerprint) the current app slides half way down the page and there's a big space left open at the top, what is this for?

Yes, iphone 6 feature. Its because alot like using it with one hand, so with the larger screens you can do that and everything slides down. Pretty cool…

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