jQuery is a Javascript library
simplifies certain common tasks such as styling, animation, DOM manipulation, and AJAX
automatically handles certain cross-browser compatibility issues
course content

• finding HTML elements using selectors
• reacting to events such as mouse clicks and key presses
• adding effects and animations to webpages
• adding/removing/changing HTML content of webpages
• using AJAX to get data from an external server

can install jQuery source locally and reference its location
cn also use snippet below to get jQuery from Google's CDN

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>