How does USDT stay at $1?

Could you elaborate on how USDT manages to maintain its peg to the US dollar? I'm quite fascinated by the mechanics behind it, given the volatile nature of the cryptocurrency market. It seems like a remarkable feat to have a stablecoin that consistently holds its value at $1, despite the fluctuations in other digital assets. I'm wondering if there's a specific mechanism or series of measures that USDT employs to maintain this peg. Could you provide a brief overview of how this works? It would be greatly appreciated.