What Are Rollups? Rollups are a Layer 2 scaling solution that boosts blockchain transaction efficiency by processing batches of transactions off-chain and then submitting them to the main chain. Two main types of Rollups: 1. Optimistic Rollups: Benefits- High efficiency, low latency. Challenges- Fraud-proofing delay (usually 1 week). 2. ZK Rollups: Benefits- Instant verification, high security. Challenges- High computational complexity, implementation difficulty.