Build tools
BUILD TOOLS
future
https://www.toptal.com/front-end/webpack-browserify-gulp-which-is-better
https://tooling.github.io/book-of-modern-frontend-tooling/dependency-management/webpack/introduction.html
what are they
things that bundle your messy files together into a big file that makes it faster to run your webpage and stuff
automating non-core-logic tasks
many other things to maintain large modern frontend things