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JavaScript is a client-side, object-based scripting language that is used to handle and validate client-side data. JavaScript is also used for making the user interface of the web pages more dynamic making it responsive to events like the movement of the mouse, mouse click on a certain HTML element, a button click, etc, using which we can improve the user experience.

JavaScript, formerly known as LiveScript, has been developed by Netscape and Sun Microsystems. It is also known as ECMAScript as it was standardized by European Computer Manufacturer's Association(ECMA). The most recent upgrades were the ECMAScript6, ES7, ES8, ES9, ES10 and the most recent ECMAScript2020 which came at the beginning of this year. Although you should update yourself with all the new features ECMAScript6 was the most significant change and we will be covering more about it towards the end of this tutorial series.