Can you send USDT without ETH?

I'm a bit confused about the cryptocurrency transaction process. I've heard that ETH is often used as a gas fee to send transactions on the Ethereum network. But what if I want to send USDT without using ETH? Is it possible? Or do I absolutely need to have some ETH in my wallet to send USDT? Can you explain the mechanism behind this? Is there any alternative way to send USDT without incurring ETH fees? I'm quite interested in understanding the nuances of this process. Thank you for your time and assistance!