Is USDC different from USDT?

Hello there, I'm curious about the differences between USDC and USDT. Could you elaborate on how they differ from each other? I've heard they're both stablecoins, but I'm not quite sure about the nuances. Could you break it down for me, please? For instance, do they have different issuers? Or are there any significant differences in their mechanisms, uses, or even their risk profiles? I'd really appreciate it if you could shed some light on this matter for me. Thank you in advance for your assistance!