Rollups are a layer-2 scaling solution built on smart contract blockchain network like Ethereum. They solve issue of high gas fees and low throughput. ZkRollups plays an important role in securing the continuity of DApps and use cases. Scalability is one of the main issues of the Ethereum network. Therefore, Zero-knowledge rollups are being developed to take some of the loads of the blockchain network. If you want to learn more about ZkRollups check out this blog.