These are my slides from the Meetup "CSS with superpowers - SASS!" at ImmobilienScout24 on November 6, 2014.
Preprocessors for CSS have become the industry standard and you'll be reading more and more about them all over the tech community. They're named LESS, Stylus or SASS. Preprocessors make CSS more flexible, maintainable and fill in where CSS has its limits and drawbacks.