Is Terra Luna and Terra Luna Classic the same?

Could you please clarify the distinction between Terra Luna and Terra Luna Classic? Are they indeed one and the same, or are they separate entities? I've heard some confusion surrounding these two terms, and I'm curious to understand the nuances and differences between them, if any. Specifically, I'm interested in knowing if they share the same blockchain, tokenomics, or have distinct goals and uses within the crypto landscape. Any clarification would be greatly appreciated.