What is the DAI to USDT swap?

I'm curious, could you explain what a DAI to USDT swap actually is? I've been hearing about it lately in the crypto circles but I'm still a bit hazy on the details. Is it a simple exchange of one cryptocurrency for another? Or is there more to it? How does the process work? Are there any specific risks or considerations I should be aware of before engaging in such a swap? I'd appreciate it if you could break it down for me in a way that's easy to understand. Thank you in advance for your help!