DeFi & Crypto Technical
Rollup
A Layer 2 scaling technique batching transactions before settlement on Layer 1.
Definition
A rollup is a Layer 2 scaling solution that batches transactions off-chain (or in a sub-chain) before settling them on Layer 1. Two main types: optimistic rollups (Optimism, Arbitrum) and zero-knowledge rollups (zkSync, StarkNet). Reduce gas costs and increase throughput.