What is USDT?

Could you please enlighten me on the concept of USDT? I've heard quite a buzz around it in the cryptocurrency world, but I'm still hazy on its exact nature. Is it a type of digital currency? And if so, how does it differ from other cryptocurrencies? Also, I'm curious about its stability. How does USDT maintain its value? Is it pegged to a specific asset or currency? Could you also explain its role in the financial ecosystem and how it's being utilized? I'm eager to learn more about this intriguing topic.