What is the difference between PB and PIB?

Could you please elaborate on the distinction between PB and PIB? As I understand, both terms are related to the world of cryptocurrency and finance, but I'm unsure of the specific nuances that set them apart. Are they different types of blockchain protocols? Or do they represent distinct financial instruments or metrics within the industry? It would be greatly appreciated if you could provide a clear and concise explanation of the key differences between PB and PIB.