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

I no longer remember when and from whom I first heard this thought, but it has settled in my mind. I will share it with you:
“In the absence of knowledge, we speak of uncertainty, while in its presence, we speak of risks. The absence of knowledge is compensated by faith.” In the fields of business education, trading, and finance.