Is Synthetix on Ethereum?

Could you please clarify for me whether Synthetix operates on the Ethereum blockchain? I'm trying to understand the relationship between these two platforms and how they interact. I've heard that Synthetix offers synthetic assets, but I'm not sure if these assets are issued and traded specifically on the Ethereum network. Could you elaborate on this matter? I'm also interested in knowing if Synthetix leverages any unique features of Ethereum, such as smart contracts, to facilitate its operations. Thank you for your assistance in clarifying this point for me.