Is Hedera built on Ethereum?

Excuse me, could you clarify something for me? I've been hearing a lot about Hedera recently and I'm wondering if it's built on the Ethereum blockchain. I've seen some comparisons and similarities drawn between the two, but I'm still not entirely sure. Could you possibly explain the relationship between Hedera and Ethereum, if there is any? I'm particularly interested in understanding the technological differences and similarities between them, as well as any potential advantages or disadvantages of Hedera being built on Ethereum, if applicable. Thank you in advance for your clarification.