CSS is an easy and straightforward language, but when it is gets too long, say for a big project with thousands of line, it turns into a nightmare.
But Sass makes CSS fun again.
Sass, Syntactically Awesome Stylesheets, is an extension of CSS3,
adding nested rules, variables, mixins, selector inheritance, and more.
It’s translated to well-formatted, standard CSS using the command line
tool or a web-framework plugin.
Why and what to use?