Module 4 was all about JavaScript. JavaScript is a modern scripting language used by way of HTML to add dynamic behaviors to a webpage. JavaScript allows for a significantly easier way of displaying, and coding functions, and their respetive outputs in multiple webpages all at once. JavaScript code can either be implemented within an HTML document, or on its own in a JavaScript document (.js) linked to one or more HTML documents. JavaScript has become the premier programming language for web pages, and is recognized as the ECMAScript standard.