JavaScript

JavaScript, often abbreviated as JS, is a common scripting language in web development. It is used to add client-side scripting to websites. JavaScript also has an extensive set of libraries, such as jQuery, a popular JavaScript library.

JavaScript can be somewhat complicated, but as you learn it, you'll eventually get the hang of it and it may not seem as complicated as it once did. Many websites offer to teach JavaScript for free, but you can also learn it from a book.

Types of JavaScript
You have two types of JavaScript to choose from
 * Internal JavaScript, loaded inside of the website's document
 * External JavaScript, loaded from an external source.