A rollup contract is a layer 2 scaling solution designed to improve the efficiency of transactions on a blockchain. It aggregates multiple transactions into a single batch, which is then recorded on the main blockchain. This process allows for faster transaction speeds and reduced costs.There are two main types of rollups: optimistic and zero-knowledge. Optimistic rollups assume that transactions are valid and only check them if there’s a dispute. This approach can lead to quicker processing times. Zero-knowledge rollups, on the other hand, use cryptographic proofs to ensure that transactions are valid before being added to the blockchain, providing enhanced security.By reducing the amount of data that needs to be processed by the main chain, rollup contracts help to alleviate congestion and lower fees. This makes blockchain networks more scalable and user-friendly, as more transactions can be handled simultaneously. Overall, rollup contracts are becoming an essential tool for improving blockchain performance while maintaining security.