Qualitative Research Method
An unstructured, exploratory research methodology based on small samples intended to provide insight and understanding of the problem setting is known as a qualitative research method.
Sources of qualitative data are interviews, focus groups, observations, etc.

Quantitative Research Method
Quantitative research method is the analysis of numerical data using mathematical and statistical tools. The data collected from questionnaires using the likert scale, semantic scale etc are analysed using quantitative research methods.
Sources of quantitative data are surveys, secondary research, etc.