• Sass is an acronym for Syntactically Awesome StyleSheets—but, of course, there's more sassiness to Sass than the acronym! Sass is an extension to CSS, which gives us additional power and flexibility when writing our CSS for our web applications. Sass, when compiled, generates well-formatted CSS for us. Specifically, the additions to CSS that Sass brings to the table include things such as nested rules, variables, conditional logic, mathematics, mixins, and more. Additionally, Sass makes it easier to maintain and organize the style sheets in our web projects. We'll be taking a look at many of these things in this crash course. 
• Sass is compatible with all versions of CSS, not just CSS3 and CSS4.
• Thanks to the Angular CLI, Sass fits nicely into our Angular applications because the CLI compiles the SASS in our components for us by default. 
• Sass's official website can be found here: https://sass-lang.com/.