What is Ecma International?
Ecma International is an industry association founded in 1961 and dedicated to the standardization of Information and Communication Technology (ICT) and Consumer Electronics (CE).
What is ECMAScript ?
ECMAScript is a scripting-language specification standardized by Ecma International.
This year ES11 (ECMAScript 2020) is released with some cool features.
Link of Documentations from ECMAScript 2015 AKA ES6 to ECMAScript 2020 AKA ES11 is given below.
ES6 : http://es6-features.org
Here is roadmap of ECMAScript Standards and how it works behind the scenes : https://accedia.com/blog/posts/accedia-blog/2019/08/29/ecmascript-release-roadmap
Here is all different types ECMA Standards (JS follows ECMAScript standard) : https://www.ecma-international.org/publications/standards/Stnindex.htm