Is sending USDT free?

I'm quite curious about the costs involved in sending USDT. Is the process entirely free, or are there any hidden fees that I should be aware of? I've heard that cryptocurrency transactions can sometimes come with unexpected charges, so I'd like to clarify this matter before proceeding. After all, it's important to me to understand all the costs associated with my transactions, especially when dealing with large sums of money. Could you please elaborate on this matter? It would greatly assist me in making informed decisions about my financial transactions.