Sass is a preprocessor scripting language that extends CSS (Cascading Style Sheets) with additional features, making it easier to write and maintain styles for web pages. It allows developers to use variables, nested rules, and mixins, which help streamline the styling process and reduce repetition in code. This results in cleaner and more organized stylesheets. By using Sass, developers can create more dynamic and responsive designs. It compiles down to standard CSS, ensuring compatibility with all web browsers. This makes it a popular choice among web developers looking to enhance their workflow and improve the maintainability of their styles.