Какие разницы между словами "отчего", "почему" и "зачем"?

Question

Answer

почему - more general, "why?"
зачем - is used to know the ultimate aim - "for what purpose?"
отчего - is used to know the origin (reason) of something - "because what?"
https://www.italki.com/question/225626

https://www.youtube.com/watch?v=BRsEIfYEIeU

Answer

почему? - why (原因, 理由)
зачем? - why (目的, 目标)
отчего  (we don't use it that often) = почему