Plasma is Ethereum's second-layer scaling solution that enhances throughput by bundling a large number of transactions off-chain and submitting a brief proof on the main chain. It employs hierarchical side chains and Merkle proofs to reduce the burden on the main chain. Users can use the exit mechanism to return to the main network in case of disputes, ensuring asset security. It is suitable for high-frequency small transactions, but its universality and programmability are limited, requiring attention to data availability and exit delays. @Plasma #plasma $XPL