What is the difference between iPhone 6s and iPhone 6?

I’ve been showing off my iPhone 6s since it arrived on Friday, and the first thing anyone asks me when they see it is, “what’s different about it?” Without a new design, the latest iPhone looks exactly the same as its predecessor — but is isn’t.
Here is the long list of things that make iPhone 6s different to — and better than — iPhone 6.
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