ZKSync is a Layer 2 scaling solution for Ethereum that aims to address the high gas fees and slow transaction times on the Ethereum network. It is based on zk-rollups, a type of scaling solution that uses zero-knowledge proofs to bundle multiple transactions into a single transaction that can be processed off-chain, while still maintaining the security and decentralization of the Ethereum network.

ZKSync allows users to perform fast and cheap transactions on Ethereum, with transaction fees that are significantly lower than the fees on the main Ethereum network. It also supports smart contracts, which allows for the development of decentralized applications (dApps) on the platform.

ZKSync is developed and maintained by Matter Labs, a research and development company focused on building scalable and secure blockchain solutions.