Which one is the real USDT?

So, can you please clarify for me, in the vast landscape of cryptocurrency, which version of USDT should I be trading with? I've heard of multiple iterations and I'm left wondering, which one truly represents the genuine, trusted, and widely accepted USDT? Is there a definitive way to differentiate the real one from any potential imitations or forks? I'm looking for a clear and concise answer that can help me navigate this often-confusing space with confidence.