Rollup

Rollups are a type of L2 scaling technology that reduces transaction costs without lessening security assumptions. Rollups are independent off-chain computation environments that perform transaction execution outside the primary layer one (L1) blockchain and send the transaction data back to the L1 network. Rollups are generally categorized by the validation mechanism that ensures the validity of the off-chain computation. Optimistic rollups and ZK rollups are the two main rollup implementations.