Aggregation refers to the process of combining or gathering data, information, or entities into a single summary or collective representation. In the context of research, aggregation involves synthesizing data from multiple sources or organizing individual pieces of information into a cohesive whole. This can help researchers analyze trends, patterns, or relationships within a dataset, make comparisons, or draw conclusions based on the aggregated information. Aggregation techniques can vary depending on the specific research question, methodology, and data sources being utilized.