Question related to namespace

Question

what is namespace. is it easier than using void

Answer 1

https://www.sololearn.com/discuss/294730/?ref=app

Answer 2

I can't answer, it is depending on the context.
If namespace is useful in shortening the code complexity, go ahead. Else, just don't use it. From the logical perspective of a programmer (I can't code in C++ though) I think what I said is right

Answer 3

so should I use namespace or not