postcss-simple-vars is a PostCSS plugin enabling the use of simple variables within your CSS files. It enhances CSS readability and maintainability by allowing you to define reusable values (like colors, fonts, or spacing) as variables and reference them throughout your stylesheet. This eliminates repetitive typing and makes updates easier. Using postcss-simple-vars promotes a cleaner, more organized CSS codebase. It ensures consistency across your project by centralizing value definitions.