Is USDT safe?

I've been hearing a lot about USDT recently, and I'm curious about its safety. Is it really secure to use USDT for transactions? I've read about some stablecoins facing issues in the past, so I'm a bit worried about potential risks. Can you explain how USDT works and why it's considered safe? Also, are there any known vulnerabilities or hacks that have occurred with USDT in the past? I'd like to understand more about its security measures and how it compares to other cryptocurrencies in terms of safety.