What network does Polygon run on?

Could you please elaborate on the network that Polygon operates on? I'm interested in understanding the foundational infrastructure that supports this popular Ethereum scaling solution. Specifically, I'd like to know if Polygon is built on an entirely separate blockchain or if it leverages an existing blockchain network, and if so, which one? Additionally, I'm curious about the benefits and drawbacks of the chosen network in terms of scalability, security, and interoperability. Thank you for your insight.