How do I know which type of USDT I have?

Excuse me, could you please clarify something for me? I've been hearing a lot about USDT, but I'm a bit confused about the different types. How exactly can I determine which type of USDT I have in my possession? Is there a specific way to identify it, or are there any distinguishing features that I should be aware of? I'd really appreciate it if you could provide some guidance on this matter. Thank you in advance.