Is ETH and BNB the same?

I'm a bit confused about the differences between ETH and BNB. Could you clarify if they are essentially the same thing, or do they have distinct functions and characteristics in the world of cryptocurrency? I've heard both being mentioned frequently in the context of finance and investing, but I'm not entirely sure how they differ from each other. It would be great if you could break it down for me in a way that's easy to understand. After all, I'm still new to this cryptocurrency landscape and trying to wrap my head around all the jargon and nuances.