Which chain is Cronos on?

I'm quite intrigued by the topic of cryptocurrencies and blockchain technology. Could you please clarify for me which blockchain network Cronos operates on? I've heard some buzz about it recently and am eager to learn more about its underlying technology and ecosystem. Is it built on a popular chain like Ethereum or is it a standalone blockchain with its own unique features? I'm also curious about its interoperability with other chains and the potential opportunities it offers for investors and developers alike. Could you enlighten me on these matters?