What are "Rollups" in crypto? - I've been hearing the term mentioned a lot recently, so I wanted to know how they differ from side chains, and layer2's. I'm still slightly unclear, but it appears layer2's are parallel blockchains to main chains like Bitcoin and Etherium. They take some transaction load off of the main chain, process them, then eventually record them back to the main chain. Rollups are a popular type of Etherium layer2 that aim to help scale the overall network. Arbitrum and Optimism are popular optimistic rollups, whereas Starknet and Loopring are popular ZK rollups. In Bitcoin instead of rollups, the layer2 is Lightning. I've heard some people make the analogy that Lightning is to Bitcoin as the IP protocol is to the internet. www.coinbase.com #