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JavaScript App.js in React - Mandatory or not

Anurag M

New Coder
Hi guys.
I have been studying React.js recently.

What I found out that when creating a new App, it automatically creates an App.js file for us.
I just want to know if keeping this file is mandatory or not.
I mean App.js is used to create a component after all, which we can create with any other name starting from scratch right?
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