As part of the Foundry application development toolkit, Forge is a practical command line tool. Using Forge within the wider development framework, developers can build, test, and ultimately deploy Ethereum-based smart contracts using Solidity. One of the unique features of the Forge tool is that it supports a variety of EVM backends. What’s more, Forge allows for faster testing methods by running parallel EVM execution that result in state diffs, as opposed to directly modifying the state.