If upgrading, please see the [blog post for 3.6.0](https://blog.jquery.com/2021/03/02/jquery-3-6-0-released/). This includes notable differences from the previous version and a more readable changelog.
[Babel](https://babeljs.io/) is a next generation JavaScript compiler. One of the features is the ability to use ES6/ES2015 modules now, even though browsers do not yet support this feature natively.
There are several ways to use [Browserify](http://browserify.org/) and [Webpack](https://webpack.github.io/). For more information on using these tools, please refer to the corresponding project's documentation. In the script, including jQuery will usually look like this...
For jQuery to work in Node, a window with a document is required. Since no such window exists natively in Node, one can be mocked by tools such as [jsdom](https://github.com/jsdom/jsdom). This can be useful for testing purposes.