This document discusses using Grunt and SASS together. It begins by introducing Grunt as a JavaScript task runner that can automate tasks like minification, compilation, testing and more. It then explains how to set up a Grunt project by installing Grunt CLI, creating a package.json, Gruntfile.js, and installing Grunt and plugins like SASS and Watch. The document next introduces SASS, noting how it adds features to CSS like variables, nesting, mixins and more. It then demonstrates various SASS features and provides a demo repository link.