Research design refers to the overall plan or strategy that a researcher uses to conduct a study. It outlines the methods and procedures that will be used to address the research question or hypothesis. Research design can vary depending on the type of study being conducted, such as experimental, correlational, qualitative, or quantitative research. It also includes details on data collection methods, sampling techniques, and data analysis procedures. The research design ultimately guides the researcher in collecting, analyzing, and interpreting data to draw meaningful conclusions and insights.