Where all can JavaScript be used?

Answer 1

To make webpages responsive😉

Answer 2

client side (with browsers help) and server side (Node.js)

Answer 3

Hi Piyush

As well as web

You can now also use it for native desktop apps using electron
https://electronjs.org/

and for mobile use React Native

https://code.facebook.com/posts/1014532261909640/react-native-bringing-modern-web-techniques-to-mobile/

Server side use node.js
https://nodejs.org/en/

so basically anywhere.