What is ECMAScript (ES) and how it is related to JavaScript (JS) ?

ECMA stands for European Computer Manufacturer's Association.
ECMAScript or ES is a standard for a scripting language given by ECMA.
It specifies the core features that a scripting language should provide and how those features should be implemented.

ES has various versions-
ES4- Abandoned
ES5- launched in 2011
ES6- launched in 2015
ES7- Finalized in 2016.

Whereas,
JavaScipt or JS is the most popular implementations of the ECMAScript Standard.

Note**- Every browser has a JavaScript interpreter.

Imp Implementations of ES ->
1. JavaScript V8 Engine.  - Engine used by Google Chrome to compile and interpret ES.
2. Jscript - used by Microsoft Internet Explorer (compiles and interprets ES )
3. JavaScript