This programming language is used in web development mostly. We call it the interactive language for a web site. This is being called so, because using this language a website can ask for information and provide alerts if necessary. So that a user can understand what he needs to do for further use!
Node js is a very popular framework now a day. It has over 30 thousand packages now. And all of those are contributed by different contributors. Also node js is a server side framework and mostly used for web development purposes.