Kroma is a blockchain platform aimed at developing a universal ZK Rollup using the OP Stack. It currently operates as an Optimistic Rollup with ZK fault proofs and utilizes a zkEVM. The platform plans to transition to a full ZK Rollup as the technology for generating ZK proofs becomes more efficient and cost-effective. Kroma supports smart contract deployment, node operation, and offers tools for developers and users to interact with its ecosystem.