A zero-knowledge Ethereum Virtual Machine (zkEVM) offers a scalable and cost-efficient solution by combining the Ethereum Virtual Machine with zero-knowledge proofs, allowing smart contracts to execute within layer-2 rollups while maintaining compatibility with existing Ethereum infrastructure. These zkEVMs enhance transaction throughput and lower costs by batching transactions and verifying them through zero-knowledge proofs on a layer-1 blockchain like Ethereum. They preserve the Ethereum developer experience by allowing seamless porting of existing dApps and smart contracts, while addressing the challenges of integrating zero-knowledge proofs with the Ethereum Virtual Machine's architecture. By optimizing for speed and security, zkEVMs provide fast finality and lower costs compared to other layer-2 solutions, leveraging Ethereum's extensive developer ecosystem and tooling. Different types of zkEVMs are categorized based on their compatibility with Ethereum infrastructure, with varying trade-offs in proving times and computational efficiency. Ultimately, zkEVMs aim to overcome Ethereum's scalability limitations, enabling a more widespread adoption of Web3 technology.