I think you can google the definition yourself. I won't deprive you of this wonderful opportunity. And different professors give a large number of different scientific definitions of what knowledge or ignorance is.

I don't remember when and from whom I heard this thought, but it stuck in my head. I'll share it with you:
"In the absence of knowledge, we talk about uncertainty, and in the presence of knowledge - about risks. The absence of knowledge is compensated by faith." In business training, trading, finance.