How to convert FDUSD to USDT?

I'm quite curious about the process of converting FDUSD to USDT. Could you please explain to me how it works? I've heard about the conversion rates and the platforms that facilitate these transactions, but I'm still a bit unclear on the actual steps involved. Would you mind walking me through it? Perhaps you could start by explaining what FDUSD and USDT are, and then go into the details of the conversion process. I'd also be interested to know if there are any fees or commissions involved, and if so, how they are calculated. Thank you for your help in clarifying this matter for me.