Not only that, you can build desktop, web, and mobile applications by only using JS.
Most Popular Programming Language
Yes, it is the world's most popular programming language and by a significant margin. There are many reasons that contribute to its popularity.
High Demand in Job Market
Not only that, JS developers are among the top paid professionals in the current job market.
Huge Community and Support
For instance, the ability to load the content of a webpage without the need to reload the entire page, form validations, change page behaviors during button clicks, and so on.
If you don't know, servers are everywhere in today's web development world and allow you to transfer chunks of data without buffering.