@eslint/core delivers the foundational functionality for ESLint, the popular JavaScript linting tool. It provides the core engine responsible for parsing JavaScript code, traversing the Abstract Syntax Tree (AST), and applying linting rules. Developers use this package indirectly when utilizing ESLint within their projects to identify and fix code style issues and potential errors. It's the bedrock upon which ESLint's linter operates, enabling customizable rules and configurations for code quality enforcement.