Is Chainlink layer 1 or 2?

Could you please clarify for me? Is Chainlink considered a layer 1 or layer 2 solution in the blockchain ecosystem? I've been hearing different opinions on this, and I'm trying to get a definitive answer. Layer 1 refers to the main blockchain itself, while layer 2 usually pertains to scalability solutions built on top of layer 1. So, where does Chainlink fit into this categorization? I'd appreciate your insights on this matter.