Is ICP built on Ethereum?

Could you please clarify for me whether ICP is indeed constructed upon the Ethereum blockchain? I've been hearing conflicting information, and I'm trying to get a clear understanding of the technological foundation that ICP relies on. Some sources suggest that ICP has its own unique architecture, while others mention Ethereum as a key component. Could you help me untangle this and provide a definitive answer? It would greatly assist me in my research and understanding of the cryptocurrency landscape. Thank you in advance for your assistance.