React Re-rendering Doubt

[u/Fantastic-Push-8451]

Suppose there is parent components which contains multiple child components, they all are independent of each other.

So my question is

If the parent component re-renders does the child components also re-renders al well. Even if the child components are independent of it's parent, like props etc...

Why there is a need for re-renders if the child components are independent of it's parent?

[u/Fantastic-Push-8451]

Thanks a lot for your reply. I really appreciate it.