Reuseable modules that can be used independent of the build system. Allow to use different module types and describe dependencies between them. i. e. code (javascript, coffeescript) data (json, text, yaml) stylesheet (css, less, stylus) image (png, jpg), shader (glsl) font (ttf, woff) template (html, jade) WebWorker (javascript, coffeescript) on-demand loaded Dependencies for module types other th