$zkSync is a Layer-2 scaling solution for $Ethereum that utilizes zero-knowledge rollups (zk-rollups) to enhance transaction speed and reduce gas fees. By batching multiple transactions off-chain and submitting concise proofs to Ethereum, zkSync ensures security while improving efficiency. Its EVM compatibility allows developers to deploy smart contracts using familiar tools. The latest iteration, zkSync Era, supports advanced features like native account abstraction and paymasters, further streamlining user interactions.