sass-lint is a Node.js tool that helps enforce consistent coding styles in Sass and SCSS files. It analyzes your stylesheets against a configurable set of linting rules, identifying potential errors, inconsistencies, and style violations. Using sass-lint improves code quality, maintainability, and collaboration within teams, ensuring a clean and uniform Sass codebase. It helps to automate style checking, saving time and effort compared to manual reviews. Customizable rules fit different project needs.