What is the difference between BNB and BNB BSC?

Can you please explain the key differences between BNB and BNB BSC? As a cryptocurrency investor, I'm curious to understand the distinct features and functionalities of each, and how they operate within the Binance ecosystem. Specifically, what are the main use cases and advantages of each token? Additionally, how do they differ in terms of their technical specifications, such as their blockchain platforms and transaction speeds? Understanding these nuances will help me make more informed decisions about my investments.