Since I have started web developing more than one decade ago until 2016 I had never heard anything about ECMAScript. In that year web developers started to talk about ECMAScript more commonly. I heard this term more and more on social networks, blog posts, tutorials and etc.
Imagine you want to find a title in a book. How you find that title without using the book’s index? You have to turn the pages and read each title until reaching the title you are searching. However, by using the book’s index, it is an easier and faster way to find that because of the page number of each title is determined in the book’s index.