Does anyone know what Google means by "Helpful Content"?

How does a computer know and determine if a piece of content helpful or not? Can they do that using AI and ML? I know that Google takes into account your site authority and backlinks profile but I am sure they use AI to determine how much content is relevant.

Can Google really retu the most helpful content? Or are they trying?

I have seen many bloggers with top notch content fail to rank at the top 10 after the HCU. WordPress ...