Is BSC the same as ETH?

Excuse me, I'm a bit confused about the terminology in the cryptocurrency world. I've heard of both BSC and ETH, but I'm not sure if they're the same thing or not. Could you please clarify the difference between BSC and ETH for me? Are they both blockchains? Do they serve similar purposes, or do they have distinct use cases? I'd appreciate any insight you could provide to help me better understand the nuances between these two platforms.