Is Chainlink linked to Ethereum?

Could you clarify for me, is Chainlink indeed interconnected with Ethereum? I've heard rumors that there's a significant relationship between the two, but I'd like to get a more definitive answer. Is Chainlink utilizing the Ethereum blockchain for its operations? Or does it merely integrate with it in some way? I'm trying to understand the nature of their interaction and how it impacts the overall crypto ecosystem. Could you please elaborate on this?