JavaScript

JavaScript

Almost all modern HTML pages are using JavaScript.  JavaScript is the scripting language of the Web. A scripting language is a lightweight programming language. JavaScript was originally developed by Brendan Eich. JavaScript code can be inserted into any HTML page, and it can be executed by all types of web browsers.  JavaScript was formalized in the ECMAScript language standard and is primarily used as part of a web browser (client-side JavaScript). This enables programmatic access to computational objects within a host environment. It’s easy to learn.
JavaScript is an essential language that all web developers MUST learn:

1. HTML to define the content of web pages
2. CSS to specify the layout of web pages
3. JavaScript to specify the behaviour of web pages.

How to enable JavaScript in browsers :
Click link to know how