Why keep two different names for the same technology?
But in fact, the definition above is wrong, because it is too vague. Let me explain:
With the emergence of browser-interpreted programming languages, the need for uniformity and standardization of technologies is becoming increasingly important.
This is why the European Computer Manufacturers Association (ECMA) wrote the first version of the ECMAScript 1 standard in June 1997 with the help of the ISO and the IEC (International Electrotechnical Commission).
Since then, each web browser editor has been working on its own language implementations, working on new features but continuing to respect the evolutions of the standard.