JavaScript and ECMAScript are two terms often used interchangeably, but it's important to note that ECMAScript is the official standard for the language.
JavaScript was created by Brendan Eich in 1995 to bring interactivity to HTML in Netscape, which was later copied by Microsoft as JScript.
The browser wars led to ECMAScript being established as the standard, with JavaScript and JScript becoming dialects of it.
JavaScript's popularity grew due to its cross-platform compatibility and ease of use, leading to its widespread adoption, and later expansions like Node.js and Deno.