Syntactically Awesome Stylesheets (Sass) is a preprocessor scripting language that is compiled or interpreted into Cascading Style Sheets (CSS). Sass is a powerful tool that extends the capabilities of CSS, allowing developers to write more maintainable, efficient, and organized stylesheets. It introduces features like variables, nesting, mixins, functions, and inheritance, which are not natively available in CSS. These features enable developers to create reusable code blocks, organize styles hierarchically, and perform calculations within their stylesheets. Sass helps to reduce code duplication, improve code readability, and streamline the styling process. It is widely used in web development to create complex and dynamic user interfaces. Sass files typically have the .sass or .scss extension. The .sass syntax uses indentation to define code blocks, while the .scss syntax is more similar to CSS and uses curly braces and semicolons. Both syntaxes are compiled into standard CSS files that can be used by web browsers.