WHAT IS MEANING BYB LITERATURE?

It seems you're asking about "BYB literature." There isn't a widely recognized genre or category of literature with that name. It's possible you're thinking of something else, or perhaps there's a specific context for this term that I'm not aware of.

Could you please clarify your question? For example:

* Do you have a specific author or book in mind that uses this term?

* What is the context in which you encountered "BYB literature"?

* Could you be thinking of a different acronym or abbreviation?

Once I have more information, I'll be happy to help you understand what you're looking for!