Yul
Yul is an intermediate programming language designed for the Ethereum Virtual Machine (EVM), used primarily within the Solidity compiler to optimize smart contract code. It provides a low-level, assembly-like syntax that allows developers to write more efficient and gas-optimized contracts by giving fine-grained control over EVM operations. Yul is often used as a target for high-level languages like Solidity, enabling advanced optimizations and custom bytecode generation.
Developers should learn Yul when working on Ethereum smart contracts that require maximum gas efficiency, such as in DeFi protocols, NFT marketplaces, or high-frequency trading applications where transaction costs are critical. It is particularly useful for writing complex contract logic, implementing custom optimizations, or auditing low-level code to identify vulnerabilities and performance bottlenecks in EVM-based blockchains.