Why Use Sass and Webpack Sass is a superset of CSS that extends CSS syntax with numerous features, including rule nesting, variable definition, includes, and mathematical operations. Key functionalities can be explored in the Official Getting Started Guide . Sass originally used the .sass file extension with a YAML-like structure that wasn't fully compatible with traditional CSS. The current Sass format (.scss) maintains full CSS compatibility. I use Sass for two primary reasons: First, for clearer CSS rule management. For example, when I have CSS rules that only apply to the website header, I can group them within a single block: header { h1 { ... } } Second, to reduce CSS file size during page loading. Although my site uses Bootstrap,...