Celestia represents a groundbreaking leap in blockchain technology, offering a modular data availability network that ensures secure scalability for users. Unlike traditional blockchains, Celestia focuses on ordering and publishing transactions, separating the consensus and application execution layers. This decoupling not only streamlines the blockchain technology stack but also empowers developers to create customized virtual execution environments akin to virtual machines. Within this innovative framework, every application enjoys its unique sovereign execution space while benefiting from Celestia's robust consensus security. Furthermore, Celestia enables seamless application updates without the need for main chain hard forks, providing a flexible and user-friendly platform for decentralized application builders.