ESLint is an open-source static code analysis tool for JavaScript. It identifies and reports on patterns found in JavaScript code using a wide range of rulesets. ESLint helps developers maintain high code quality by detecting potential errors, enforcing coding standards, and ensuring consistent code style. It supports custom configuration, allowing developers to disable or modify rules to fit their project needs. ESLint integrates seamlessly with popular IDEs and text editors, providing real-time feedback and suggestions as you write code. It is highly extendable and allows for the creation and sharing of custom rules. Whether you're working on a personal project or a large codebase, ESLint is a valuable tool for improving the overall quality and maintainability of your JavaScript code.