What is the difference between USD USDC and USDT?

Ah, indeed, the distinctions between USD, USDC, and USDT are rather intricate. Could you elaborate on the fundamental differences between these three? I'm particularly interested in understanding how USDC and USDT, as stablecoins, differ from traditional USD in terms of their issuance, regulation, and technological underpinnings. Also, how do their respective issuance mechanisms and regulatory statuses impact their trustworthiness and overall market acceptance? I'm eager to gain a deeper understanding of these nuances as they seem to play a pivotal role in the ever-evolving cryptocurrency landscape.