Is Beam built on Ethereum?

Could you please clarify for me if Beam is indeed constructed upon the Ethereum blockchain? I've heard some conflicting information and I'm eager to understand the technical foundation Beam rests upon. Is it leveraging the smart contract capabilities of Ethereum or does it have its own unique architecture? Furthermore, if Beam isn't based on Ethereum, could you enlighten me on the blockchain it does utilize and what advantages it might offer compared to Ethereum? Thank you for your assistance in clarifying this matter.