What can JavaScript really do?

Question

I had actually thought JavaScript was only used with HTML and CSS to make a web page interactive. But I youtube video where it was used to make a video chat app. So it makes me wonder how much JavaScript can be used for and also it's limitations.
I am a beginner in Javascript programming.

Answer 1

javascript has a wide variety of uses. you known it as a programming language to add interactivity to websites, but it can also do things such as (but not limited to): creating phone apps, creating web apps (react, vue, angular, etc) creating web servers (NodeJS), game development (for example: Unity), and much more!

Answer 2

Martin Taylor Wow. I didn't know JavaScript could do so much. I thought it was lightweight compared to other programming languages like Java and C++. I thought that was why it is usually recommended to beginners.