What is the difference between Binance and Binance Smart Chain?

Could you elaborate on the key distinctions between Binance and Binance Smart Chain? As a cryptocurrency enthusiast, I'm curious to understand the fundamental differences between the two platforms. Binance, I know, is a leading cryptocurrency exchange, but what role does Binance Smart Chain play in this ecosystem? Is it a separate blockchain network? How do they complement each other? What are the unique features and advantages of Binance Smart Chain compared to other smart contract platforms? I'd appreciate a concise yet comprehensive breakdown of the differences between the two.