Zk-rollups are a layer-2 scaling solution designed to enhance blockchain scalability by moving computation and state off-chain while keeping transaction data on-chain, thus allowing for higher transaction throughput and reduced costs. By utilizing zero-knowledge proofs, zk-rollups cryptographically verify the validity of state changes, maintaining the security of the base layer, such as Ethereum, while posting only bundled transaction batches. Compared to optimistic rollups, which rely on a fraud proof mechanism, zk-rollups are seen as a potentially more optimal long-term solution due to their cryptographic verifiability. However, they face challenges such as potential liquidity fragmentation and upgradability risks. Despite these challenges, zk-rollups are considered promising for scaling the blockchain economy, offering the ability to create specialized computing environments while preserving critical properties like censorship resistance and trust-minimization. As blockchain technology evolves, zk-rollups are expected to play a crucial role in enabling the widespread adoption of Web3 by unlocking more blockspace and facilitating the transition of various industries to blockchain-based systems.