The following is a guest post by Aleks Hudochenkov. Aleks does a great job here of showcasing what PostCSS is good at and the role it has grown into in the front end stack. That is: doing little useful jobs within CSS. You're about to see a variety of PostCSS plugins at work that are all related to working with images. By the end, I bet you'll be able to imagine how PostCSS can be useful for other niches within working with CSS.