1. Experimental Research: This type of research involves conducting controlled experiments to test hypotheses and gather data. Researchers manipulate variables and observe the effects on other variables to determine causation. Experimental research is typically used in scientific fields such as biology, psychology, and physics. 2. Survey Research: Survey research involves collecting data from a group of participants through questionnaires or interviews. Researchers use surveys to gather information about attitudes, beliefs, behaviors, and preferences. Survey research is commonly used in social sciences, marketing, and public opinion research. 3. Qualitative Research: Qualitative research focuses on understanding the meanings and interpretations of experiences, behaviors, and phenomena. It involves collecting and analyzing non-numerical data such as interviews, observations, and textual analysis. Qualitative research is often used in fields such as anthropology, sociology, and education. 4. Quantitative Research: Quantitative research focuses on collecting and analyzing numerical data to test hypotheses and make predictions. Researchers use statistical methods to analyze data and draw conclusions about relationships between variables. Quantitative research is common in fields such as economics, psychology, and epidemiology. 5. Mixed-Methods Research: Mixed-methods research combines both qualitative and quantitative research methodologies to provide a comprehensive understanding of a research problem. Researchers collect and analyze both numerical and non-numerical data to gain deeper insights into complex issues. Mixed-methods research is used in various disciplines, including education, healthcare, and organizational psychology.