Is cartesi on Ethereum?

I'm curious to know if Cartesi is built on the Ethereum blockchain. Could you clarify if Cartesi utilizes the Ethereum network or if it operates on a separate platform? Understanding the foundation of Cartesi's infrastructure is crucial for evaluating its potential and compatibility with other blockchain projects. Additionally, how does Cartesi's relationship with Ethereum, if any, impact its security, scalability, and interoperability?