What is (S)CSS?

Sass (Syntactically Awesome Style Sheets) is a CSS preprocessor, which means it's a scripting language that extends CSS by adding features like variables, nesting, mixins, and functions. It allows you to write more modular, maintainable, and efficient CSS. SCSS is a syntax of Sass which is fully CSS-compatible, meaning that every valid CSS stylesheet is also a valid SCSS file. SCSS is the most common Sass syntax. It's commonly used to generate CSS for websites and web applications, making styling more manageable, especially for large projects.