Layer2
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What is Ethereum's Layer2 that has been talked about recently? Background and overview - ZENISM
Layer2 aims to reduce transaction fees and improve transactions on Ethereum.
Layer2 literally means "second layer". So what is the "first layer"? It is the Ethereum blockchain.
Layer2 (second layer) is stacked on top of the Ethereum blockchain (first layer).
The idea is that it is difficult to do all the processing on Ethereum (on-chain), so some processing can be done off Ethereum (off-chain).
Types of Layer2
zk Rollups
Some of the drawbacks are that they are not EVM compatible.
zkSync and StarkEX are well-known.
dYdX, which utilizes StarkEX's technology, is one of the DEXs that supports it.
Optimistic Rollups
EVM compatible and Solidity can be used.
More convenient than ZK Rollups that cannot use EVM.
Optimism and Arbitrum are well-known.
Layer2
A method devised to address Ethereum's Main Chain scaling problem.
Solve the scaling problem by using a separate Layer2 chain for calculation and data storage, separate from the Mainnet.
Layer2 future predictions - Technology that supports NFT platforms | withB
In the short term, I think Optimism and Arbitrum, which adopt Optimistic Rollups, will be widely used. The reason is that they are developer-friendly and can use the Solidity code of Summary of Layer 2 technologies, Plasma and Channels, and Semi-Layer 2 technologies, ORU and ZkR (Ethereum Virtual Machine) as is.
However, in the long run, I think Zk Rollups will win. The reason for this is that Optimistic Rollup has the disadvantage of not being able to withdraw for 7 days, which is solved by ZK-Rollup.
zkSync is trying out Zk Rollups.