I can't find a good definition of what is alpha. I can only find what alpha does or has, but no what he is. What is it?

I've seen men who are successful with women that get laid a shit ton. Men part of the minority who fuck most women, but what makes you call them alpha? Is it what they do? what they have?

What are they? Alpha is or is Alpha made? Please do tell.

I have my own schema of what is Alpha an Alpha who is born and dominates his environment because he is made for it. Every single time I share get shamed ironically by the same men who dislike women who do that.

Tell me what is this alpha because the more wait the more I think this 'Alpha' you say is more like a unicorn.