Is Polygon on Ethereum?

Hello there, I'm curious about the relationship between Polygon and Ethereum. I've heard that Polygon is somehow connected to Ethereum, but I'm not entirely sure how. Could you please explain if Polygon is indeed on Ethereum, and if so, what does that mean in terms of their relationship and functionality? I'm interested in understanding the technical details and how it benefits users and developers. Thank you in advance for your clarification.