Is USDT a real thing?

I'm quite puzzled about something, could you possibly enlighten me? I've been hearing a lot about USDT recently, but I'm not entirely sure if it's legitimate or just another hoax in the vast and often murky world of cryptocurrency. Could you clarify for me if USDT is indeed a real thing? I've seen it mentioned in various finance forums and articles, but I'm still skeptical about its authenticity. Your expert opinion would be greatly appreciated. After all, investing in cryptocurrency is already a risky endeavor, and I wouldn't want to add another layer of uncertainty by investing in something that might not even exist.