JavaScript is a programming language that was created in 1995 by Brendan Eich while working at Netscape Communications Corporation. It is a high-level, dynamic, and interpreted programming language that is widely used for creating interactive web pages, web applications, and other network-based applications.

JavaScript is the programming language of the web, and it is supported by all modern web browsers. It was first released in beta version in September of 1995 as part of Netscape Navigator 2.0 and was called Mocha at that time. It was later changed to LiveScript and then to JavaScript to capitalize on the popularity of Java. JavaScript quickly became the de facto standard for creating interactive web pages and has since been extended to run on servers, mobile devices and other platforms. Node.

js is a popular platform that allows JavaScript to be used on the server side and React Native is a framework that allows developers to write code once and deploy it on multiple platforms. With the popularity of JavaScript, many other languages have been created to be similar to it, such as TypeScript, CoffeeScript, and Dart.