What Is The Definition Of Authority Site?

I remember in the WA training. Kyle always mentions the words "authority site. What we learn is to create an authority site. It says if our site can become an authority site, it can earn a large amount of money.
But, what constitutes an "authority site"?
Of course, quality content is a must.
"Content is king" is always right. It firmly exists in my mind. No one is willing to see rubbish. It's common sense. Will you?
My questions are....
What is the minimum number of post to be an "authority site"?
Do any common consent in affiliate dictionary?
Does anyone think about this?
If it has a number, at least we have the aim in our mind.
Do any other elements or plugins are necessary for the authority site?
If you have any opinion, please share with us. Or, we can discuss together to make it clear.
Thank you so much.
I believe that if readers find our writings to be informative and reliable, they will return to our blog, and they may even recommend us to others. This will help to improve your ranking.
Imagine you were looking for stock news on TV, you probably wouldn't go to CNN. I'm not saying you wouldn't get any stock news on CNN, if you wanted more in-depth information you would probably go to Bloomberg News
I would approach any niche like that. I would read up everything I could. If someone approached me with a question I could not answer, I would tell them that I needed to go research that, which I did and then gave them an authoritative answer. Many niches have more than just reading material available so I would avail myself of these materials in order to become an expert.
As far as the number of posts in my blog, I think it really revolves around how many real answers are you giving people when they need them.
Ellen