Are Ethereum and USDT the same?

Could you please clarify the differences between Ethereum and USDT? As a cryptocurrency enthusiast, I'm often asked about the various digital assets available in the market, and this question particularly piques my interest. Ethereum, as I understand, is a decentralized platform that enables smart contracts and decentralized applications to be built and run without any fraud, censorship, or third-party interference. On the other hand, USDT seems to be a stablecoin pegged to the value of the US dollar. Is there any overlap in their functionalities, or are they entirely distinct in their use cases and underlying technology? I'd appreciate your insights on this matter.