When to use .js files and when .jsx? How do they differ from each other?

Question

React

I noticed that some people use the .jsx extension to create react components.

How is it different from .js?

When does it apply?

Answer 1

I use jsx when I have jsx markup.
If pure js, then js.
But I also know the approach when jsx is always used.

Answer 2

There is no reason to follow this rule from Airbnb's lint.
Create a crite react app and you will see that .jsx files are not used there.