What are CSS Preprocessors, and why are they used?

Thank you for posing such a relevant and insightful question, especially considering the evolving landscape of web development today. CSS Preprocessors, such as Sass, LESS, and Stylus, have significantly shaped how we approach styling web applications. At their core, CSS Preprocessors are scripting languages that extend the default capabilities of CSS by introducing features like variables, mixins, functions, and logical operations. These processors then compile this extended CSS down to standard CSS, which can be interpreted by web browsers. The primary reason for using CSS Preprocessors is to enhance productivity and maintainability in styling web applications...