stdafx.h: When do I need it?

Question

I see so much code including stdafx.h. Say, I do not want pre-compiled headers. And I will include all the required system headers myself m

Answer 1

stdafx.h is just another header file. If you fell you don't need it feel free to not include it and remove it from the project.

However it's quite typical to have a file like stdafx.h exactly for precompiled headers to work and to not include all the stuff manually in each source file.