ZK-Rollups are a layer 2 scaling solution for blockchains that enhance transaction throughput while maintaining security. They bundle multiple transactions into a single proof, which is then submitted to the main blockchain. This reduces the amount of data that needs to be processed on-chain, allowing for faster and cheaper transactions. The "ZK" in ZK-Rollups stands for "Zero-Knowledge," referring to the cryptographic proofs used to verify transactions without revealing their details. This ensures privacy and security, making ZK-Rollups an attractive option for applications requiring high scalability and confidentiality, such as decentralized finance (DeFi) and non-fungible tokens (NFTs).