What distinguishes qualitative research methods from those categorized as quantitative methods? (English Edition)

As long as people have been able to openly share ideas, traditions and opinions with each other, some form of qualitative research methods have been in practice. Many argue that it is not an exact science and leaves much to interpretation; however it can be a very useful research method in analyzing social human behaviors.

This article addresses: What distinguishes qualitative research methods from those categorized as quantitative methods? What types of questions can qualitative research address that cannot be addressed by quantitative research?