What/how to utilize eMMc

OK, I feel I should know this or can Google it, but I have the Renegade elite (ROC-RK3399-PC), and the specs says it has eMMC 5.X. First question, is what is eMMC? And then how can I utilize it? I see one other post on here about this board and re-binding, but really nothing else. I would like to utilize this card as best as possible and since it has eMMC I would like to take advantage of it if I can. I assume this is different then microSD card, which there is a slot for. And if the eMMC is a storage component, how do I get software on there and then boot from there?

If you have any subsequent questions, you can post here or on that thread.