ZK-Rollups bundle hundreds of transactions off-chain and produce a cryptographic proof, known as a zero-knowledge proof, which is then submitted to the base blockchain. This mechanism allows for the scalability of the network as fewer transactions need to be processed directly on the blockchain. The cryptographic proofs ensure that the off-chain transactions are valid without revealing any sensitive information about them, thereby preserving privacy. This method reduces congestion on the main blockchain and allows for faster throughput and lower fees, making it an attractive solution, especially for decentralized applications (dApps) and high-frequency trading.