Optimistic Rollup

Optimistic Rollup is one of the Rollup solutions in the Layer2 (L2) ecosystem. It is considered a strong contender for L2 scalability, along with other solutions like zk-Rollup.

Unlike zk-Rollup, Optimistic Rollup uses a mechanism called Fraud Proof, which introduces a delay in withdrawing funds from L2 to L1. However, it offers advantages such as lower gas fees, cost-effectiveness, and technical simplicity, making it a popular choice in the current L2 landscape. More information can be found here(https://bokujyuumai-salon.ethereum-japan.net/wiki/13383).

Optimistic Rollup is being adopted by projects like Optimism and Arbitrum, indicating its compatibility with the Ethereum Virtual Machine (EVM).

On the other hand, the counterpart of Optimistic Rollup is Zk-Rollup.