Rollups are a layer 2 scaling solution designed to increase the transaction throughput of blockchains. They bundle multiple transactions into a single batch, reducing the amount of data that needs to be processed and stored on the main chain.There are two main types of rollups: optimistic and zero-knowledge. Optimistic rollups assume transactions are valid and only execute smart contracts when a dispute arises, which can lead to faster processing times. Zero-knowledge rollups use cryptographic proofs to verify transactions, ensuring that they are legitimate before being added to the main chain.By processing transactions off the main blockchain, rollups help alleviate congestion and lower gas fees while still maintaining a connection to the security of the main chain. This makes them a popular choice for applications that require high throughput, such as decentralized exchanges and gaming platforms.Overall, rollups enhance scalability and efficiency, allowing users to enjoy faster transactions without compromising on security.