Is the Polygon built on Ethereum?

I'm curious about the technological foundation of Polygon. Could you clarify whether Polygon is indeed constructed upon the Ethereum blockchain? It's a question that's been swirling in my mind for quite some time. I've heard rumors that Polygon leverages Ethereum's scalability and security, but I'd like to hear a more detailed explanation. Could you elaborate on the relationship between Polygon and Ethereum? How does this partnership enable Polygon to offer its unique set of features and functionalities? I'm eager to understand the technical intricacies behind this collaboration.