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Plasma can expand our interaction with blockchain-based digital assets, but these assets should be created by the Ethereum main chain first. Then, we deploy the actual game application to the sub-chain in the form of smart contracts, so that the sub-chain contains all the logic and rules of the game. It does this by creating "child" blockchains that are attached to the "master" Ethereum blockchain.
Plasma side chains support multi-level side chains and use MapReduce mode to perform parallel calculations, which can greatly improve side chain performance. The block header and hash data of the side chain will be sent to the main chain, and Proof of Fraud can be used to ensure the correctness of sub-chain transactions.
Difference between Plasma and Raiden
Raiden Network aims to provide transactions with higher scalability, faster transaction speed, more privacy protection, and lower cost, so that both parties can trade in the transaction channel. Plasma is a concept that uses a side chain hierarchical tree to expand the scale of transactions. The transactions originally executed on the main chain are placed on the side chain for execution. Plasma is the blockchain in the blockchain. Plasma's implementation will complement the Raiden Network. It is even possible to establish a status channel on the Plasma sub-chain.