Definition, I believe, you can look up yourself. I won't deprive you of this wonderful opportunity. Moreover, various professors provide a wealth of different scientific definitions regarding what knowledge or lack of knowledge is.

I can’t quite recall when and from whom I heard this thought, but it has lodged itself in my mind. I’d like to share it with you:
“In the absence of knowledge, we speak of uncertainty, while in its presence, we talk about risks. Lack of knowledge is compensated by faith.” In learning about business, trading, and finance.