Javascript is used by programmers across the world to create dynamic and interactive web content like applications and browsers. JavaScript is so popular that it's the most used programming language in the world, used as a client-side programming language by 96.0% of all websites.
JavaScript (JS) is a lightweight, interpreted, or just-in-time compiled programming language with first-class functions. While it is most well-known as the scripting language for Web pages, many non-browser environments also use it, such as Node.js, Apache CouchDB and Adobe Acrobat.
The primary use of JavaScript is to build web-based applications. Some of what JavaScript can do for the web includes: adding interactive behavior to web pages like zooming in and out or playing audio/video. creating web and mobile apps, the most popular examples consist of the likes of Netflix and Uber.