javaScript is most widely used nowadays and the most preferable language for development as front-end as well back-end with its many frameworks.

ECMAScript is a subset of JavaScript. JavaScript is basically ECMA Script at its core but builds upon it. Languages such as ActionScript, JavaScript, JScript all use ECMAScript as its core. As a comparison, AS/JS/JScript are 3 different cars, but they all use the same engine… each of their exteriors is different though, and there have been several modifications done to each to make it unique.

The ECMAScript specification is a standardized specification of a scripting language developed byBrendan Eich ofNetScape; initially named Mocha, then LiveScript, and finally JavaScript.