Primary research involves collecting original data through methods like questionnaires, interviews, and experiments. It allows the researcher to focus on specific issues and have control over data collection. However, it is more expensive and time-consuming than secondary research. Secondary research uses data collected by other researchers from sources like government records, books, and statistics agencies. It is quicker than primary research but the data may not be tailored to the researcher's specific needs. Qualitative research provides in-depth insights through open-ended questions but takes a long time. Quantitative research uses surveys and statistics to understand things like preferences but the research scope may be narrow.