What is jQuery? 

jQuery is a fast and concise JavaScript Library that simplifies HTML document traversing, event handling, animating, and Ajax interactions for rapid web development.

 -Official jQuery website

jQuery is not a language in itself; it is a JavaScript framework that helps to code JavaScript more easily and efficiently. The good points of jQuery are as follows:

• It simplifies JavaScript syntax
• It has fixed most of the issues that JavaScript will have between each web browser
• It makes deployment safer across all platforms
• It's easy for a beginner to understand
• It has many libraries and a big community

To use jQuery, we'll just need to link a script to our HTML, but, fortunately, with HTML boilerplate, jQuery is already integrated. The following is the line in our HTML that calls the URL and downloads the jQuery file:

<script src="https://code.jquery.com/jquery-3.2.1.min.js" integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4=" crossorigin="anonymous"></script>

jQuery...