Is USDT free to send?

Excuse me, could you clarify something for me about USDT? I've been hearing a lot about it recently and I'm trying to understand its functionality. Is USDT free to send? I mean, do I have to pay any fees or charges when I transfer it from one wallet to another? It seems like a convenient way to store value, but I want to make sure I understand all the costs involved. Could you please explain the process to me? I'd really appreciate it if you could break it down in simple terms. Thank you in advance for your help!