This document discusses different types of research data. Primary research involves original research conducted through methods like interviews and questionnaires. Secondary research uses existing sources like published literature. Qualitative data describes non-numerical information like opinions, while quantitative data uses numerical values and can be analyzed statistically. Both have advantages and disadvantages - primary research allows customization but is more resource-intensive, while secondary research is easier but relies on existing information. Qualitative data provides rich details but is subjective, whereas quantitative data allows aggregation but lacks depth.