SASS (Syntactically Awesome Stylesheet) is a CSS pre-processor, which helps to reduce repetition with CSS and saves time.
Sass is an extension of CSS that adds power and elegance and allows you to use variables, nested rules, mixins, inline imports and more CSS-compatible syntax
In CSS, if you want to set a bunch of properties in the same namespace, you have to type it out each time.
If you have a directory with many Sass files, you can also tell Sass to watch the entire directory