If you've build anything on the modern web, you've used

.

Nothing works without it. When I first started learning web development I didn't pay much attention to it. But once I got deeper into learning

and React (more on that in my

React is a Potato

talk) and I needed a to understand what was up with the all the .babelrc files in my projects.

Here's my quick one-shot summary of it:

A good follow-up read is