Is Celo on Ethereum?

As a seasoned individual in the realm of cryptocurrencies and finance, I often come across questions pertaining to the intricacies of various blockchain projects. One such query that has piqued my interest recently is: "Is Celo on Ethereum?" This question begs for clarification on the relationship between the two platforms. Is Celo a fork or an offshoot of Ethereum? Does it utilize Ethereum's codebase or consensus mechanism? Or is it a completely separate blockchain with its own unique set of features and functionalities? Answering this question can help investors and enthusiasts understand the positioning and potential of Celo in the broader cryptocurrency ecosystem.