What is Parcel in React.js
Parcel is what we call a web application bundler.
When you build a React app, you aren't just writing standard HTML and CSS. You’re using:
JSX (which browsers can't read).
ES6 Modules (
importandexport).Sass/PostCSS or other styling languages.
Images and Assets.
Parcel takes all these disparate, messy files and "bundles" them into a few clean files (HTML, JS, and CSS) that a browser can actually understand and display.
For more info check : Parcel