What is CSS preprocessor and why to user one?

A CSS preprocessor is a scripting language that extends the standard capabilities of Cascading Style Sheets (CSS) by enabling the use of variables, functions, mixins, and other logical constructs in CSS code. These preprocessors allow developers to write code in the preprocessor's syntax, which is then compiled into standard CSS syntax that browsers can interpret[2][7].

Why Use a CSS Preprocessor?

1. Enhanced Functionality and Efficiency: CSS preprocessors introduce features like variables, mixins, and nesting, which are not available in plain CSS. This allows for more dynamic and powerful stylesheets. Variables enable consistent theming across a website by defining and reusing common values such as colors, fonts, and spacing. Mixins allow for reusable blocks of code, reducing repetition and increasing maintainability[1][3].

2. Improved Organization: Preprocessors support the organization of CSS code into a more manageable structure. This includes the ability to nest selectors within one another, mimicking the HTML structure, which makes the stylesheets easier to read and maintain. Additionally, CSS files can be split into smaller, modular files that can be imported as needed, which is particularly useful in large projects[3][4][11].

3. Time-Saving Features: Many preprocessors offer advanced features like loops and conditionals, which can automate and simplify complex repetitive tasks. This can significantly speed up the development process and reduce the chances of errors[5][12].

4. Cross-Browser Compatibility: Preprocessors can automatically handle browser-specific prefixes and adaptations, ensuring that styles render consistently across different browsers without requiring manual intervention[3][6].

5. Community and Tools: There is a robust community and a wide range of frameworks and libraries available for most CSS preprocessors, providin...