Can I sell USDT for USD?

I'm a bit confused about the cryptocurrency market. Could you please clarify something for me? I've been holding some USDT, and I'm wondering if it's possible to convert it back to USD. Is there a straightforward way to do this? I've heard about exchanges, but I'm not sure how the process works. Could you explain the steps involved in selling USDT for USD? I'd appreciate it if you could also mention any fees or commissions I might have to pay during the transaction. Thank you for your help!