Is Aptos an Ethereum?

Excuse me, could you clarify something for me? Is Aptos considered an Ethereum? I've been reading about different blockchain projects and cryptocurrencies, and I'm trying to understand the distinctions between them. I know Ethereum is a popular platform for smart contracts and decentralized applications, but I'm not sure if Aptos falls into that same category. Could you enlighten me on this, please? It would be greatly appreciated if you could explain the relationship, if any, between Aptos and Ethereum.